...lived over 700 million years ago in...
...lasted about 40 million years (about 565...
...565 to 525 million years ago) during...
...began about 543 million years ago). The...
...(565 to 543 million years ago) and...
...China from 570 million years ago and...
...543 to 525 million years ago. During...

...Devonian period (~375 million years ago) some...
...Carboniferous, some 360 million years ago. The...
...began about 250 million years ago. The...
...Mesozoic ended 65 million years ago and...
...Cretaceous about 130 million years ago. I....
...evolved some 145 million years ago during...
...40 - 60 million years ago, specialized...
...identified about 1.3 million living species of...
...10 to 20 million to as many...
...100 to 200 million. CHARACTERISTICS OF THE...
...at least 700 million years ago. Phylogenetic...
...billion to 542 million years ago) This...
...are about 575 million years ago. These...
...(542 to 251 million years ago) At...
...happened in 40 million years, 542 -...
...Silurian, about 420 million years ago. There...
...early as 475 million years ago, in...
...land about 450 million years ago. Scorpions...
...lands about 360 million years ago, in...
...Carboniferous, about 300 million years ago. The...
...occurred about 250 million years ago and...
...(251 to 65.5 million years ago) Early...
...appeared about 150 million years ago in...
...from about 135 million years ago, in...
...flowers about 130 million years ago. Again,...
...Cretaceous extinction (65 million years ago) marks...
...Cenozoic Era (65.5 million years ago to...

...evolved about 360 million years ago, near...
...period, about 130 million years ago. A...
...algae over 500 million years ago Several...
...from about 550 million years ago. Fossilized...
...the mid-Ordovician (460 million years ago) deposits...
...generate over 50 million spores. When immature,...
...the first 100 million years that terrestrial...
...evolved over 400 million years ago Cooksonia,...
...plant over 400 million years old, is...
...period about 290-360 million years ago. These...

...first eukaryotes. 700 million years ago: soft-bodies...
...multicellular life. 540 million years ago: hard-bodied...
...multicellular life. 476 million years ago: first...
...occurred before 476 million years ago, during...
...appeared about 476 million years ago and...
...lasted about 60 million years. Three types...
...of about 60 million years, plant diversified...
...410 and 360 million years ago, the...
...350 and 290 million years ago. Extensive...
...250 to 120 million years ago, from...
...the last 145 million years approximately. Flowers...
...lived about 385 million years ago, are...
...as buoyant. 400 million-year old fossils show...
...Appeared about 380 million years ago. Vessel...
...Appeared about 250-270 million years ago. Transporting...
...Appeared about 145 million years ago during...
...PLANTS About 475 million years ago, in...
...of about 50 million years, plant diversified...
...evolved about 360 million years ago. Their...
...the Silurian (~420 million years ago) rocks...
...simple roots 400 million years ago. From...
...recorda about 410 million years ago. Megaphylls...
...appeared about 370 million years ago, at...
...period about 290-363 million years ago. The...

...lineage about 530 million years ago, during...
...450 to 375 million years ago. Most...
...far as 510 million years ago, had...
...360 to 400 million years ago) has...
...period, about 360 million years ago. A...
...425 to 450 million years ago. 2....
...land over a 50-million-year period from 400...
...400 to 350 million years ago. For...
...dawned about 245 million years ago, most...
...period, about 300 million years ago. Reptiles...
...more than 200 million years in two...
...lived about 150 million years ago, during...
...evolved over 220 million years ago from...
...America about 12 million years ago and...
...again about 3 million years ago when...
...80 to 100 million years ago, but...
...at least 125 million years ago. Adaptive...
...from about 45 million years ago, support...
...By about 40 million years ago, monkeys...
...monkeys about 25-30 million years ago. With...
...the last few million years. Paleoanthropology is...
...the past 6 million years. It increased...
...than about 1.5 million years are from...
...lived over 4 million years ago. Other...
...go back 6 million years, closer to...
...5 - 7 million years ago. One...
...2.5 to 1.6 million years old. This...
...evolved by 1.6 million years ago. The...
...from about 1.8 million to 500,000 years...
...Africa over 1.5 million years ago, when...

...about: A. 5 million years ago B....
...ago E. 10 million years ago 7....
...present about 200 million years ago is...

...protists around 600 million years ago. There...
...evolved around 600 million years ago. 1....
...happened approximately 600 million years ago. 2....
...It happened 540 million years ago. b....
...1. Over a million identified species 2....
...vertebrates evolved 540 million years ago. 1....
...Devonian period (416–360 million years ago)—called “Age...
...They evolved 470 million years ago. 3....
...dinosaurs about 160 million years ago. ii....
...mammals evolved 200 million years ago. 2....
...masses around 60 million years ago. 3....
...ancestral primates several million years ago. •...
...5 to 7 million years ago. Several...
...common ancestor 5–7 million years ago. b....
...Australopithecus afarensis i. 3.2-million-year-old female nicknamed Lucy...
...ancestral primates several million years ago. Hominin...
...ancestral primates several million years ago. ?...
...ancestral primates several million years ago. ?...

...first evolved 100 million years ago, when...
...ii. Approximately 50 million years ago, Australia...
...suddenly. a. 450 million years ago i....
...extinct. b. 370 million years ago i....
...extinct. c. 251 million years ago i....
...extinct. d. 205 million years ago i....
...animals. e. 65 million years ago i....
...billion to 541 million years ago b....
...541 to 251 million years ago b....
...541 to 488 million years ago ii....
...ago ii. 541 million years ago: explosion...
...488 to 444 million years ago d....
...444 to 416 million years ago ii....
...ago ii. 420 million years ago: Plant...
...416 to 359 million years ago ii....
...ago ii. 370 million years ago: Animals...
...359 to 299 million years ago g....
...299 to 251 million years ago ii....
...ago ii. 251 million years ago: A...
...251 to 65 million years ago b....
...251 to 200 million years ago ii....
...ago ii. 230 million years ago: First...
...200 to 146 million years ago d....
...146 to 65 million years ago ii....
...ago ii. 100 million years ago: Flowering...
...Era a. 65 million years ago to...
...65 to 2.6 million years ago ii....
...ago ii. 65 million years ago: extinction...
...period i. 2.6 million years ago to...
...Pangea 1. 200 million years ago all...
...explosion occurred 530 million years ago with...

...Answer: c. 5.6 million Correct Answer: c....
...Answer: c. 5.6 million Feedback: The answer...
...answer is: 5.6 million HIV/AIDS, malaria and...
...year, nearly 8 million people contract tuberculosis...
...tuberculosis and 5 million are infected with...
...a staggering 500 million people are infected...

...Cambrian period, 540 million years ago, slender...
...For nearly 200 million years, vertebrates were...
...but about 360 million years ago, the...
...than the 1 million insect species on...
...Cambrian explosion 530 million years ago. The...
...more than 300 million years. Vertebrates with...
...period, about 470 million years ago, and...
...Devonian period, 360 million years ago. Sharks...
...more than 300 million years. Now chondrichthyans...
...become extinct 75 million years ago, has...
...took place 360 million years ago, when...
...Acanthostega from 365 million years ago had...
...lived about 370 million years ago. No...
...lived some 320 million years ago. Reptiles...
...they arose 310 million years ago. The...
...period, about 310 million years ago. The...
...died out 200 million years ago, at...
...Cretaceous period, 65 million years ago, pterosaurs...
...at least 220 million years ago, when...
...turtles are 220 million years old, with...
...lived about 150 million years ago, during...
...Cretaceous-Paleogene boundary, 65.5 million years ago. Most...
...the Triassic, 200 million years ago. These...
...America about 12 million years ago and...
...again about 3 million years ago when...
...dated to 100 million years ago by...
...data and 60 million years ago by...
...from about 45 million years ago, support...
...monkeys about 20–25 million years ago and...
...the past few million years. Our own...
...which lived 6–7 million years ago. Sahelanthropus...
...that lived 4.5–4 million years ago, show...
...4 and 2 million years ago. The...
...3 and 2.4 million years ago. From...
...of Ethiopia. This 3.2-million-year-old fossil, nicknamed “Lucy,”...
...at least 1 million years. A. afarensis...
...ancestors of 30–35 million years ago were...
...were tree-dwellers. Ten million years ago, the...
...others. About 1.9 million years ago, hominins...
...tool use is 2.5-million-year-old cut marks on...
...2.4 to 1.5 million years old. This...
...Fossils from 1.9–1.6 million years ago are...
...dating back 1.8 million years, were discovered...