...the nucleus of most atoms. Protons (have...
...neutral. Isotopes in most cases are when...
...that the inner most shell of all...
...in the outer most orbital are the...
...strongest and of most import in biology....
...in the outer most shell to become...
...in its outer most shell to become...
...the incomplete outer most orbitals of the...

...one of the most successful groups of...
...and the cephalochordates—are most closely related to...
...skeletal support throughout most of the length...
...during swimming In most vertebrates, the notochord...
...the pharynx. In most chordates, these grooves...
...head and neck. Most chordates have a...
...are lancelets. Tunicates most resemble chordates during...
...years ago. The most primitive of these...
...and freshwater environments. Most lampreys are parasites...
...of cartilage. Unlike most vertebrate cartilage, however,...
...vertebrates called placoderms. Most placoderms were shorter...
...the biggest and most successful vertebrate predators...
...than bone. In most species, parts of...
...streamlined bodies of most sharks enable them...
...over the gills. Most sharks are carnivores...
...very different lifestyle. Most rays are flattened...
...the gill chambers. Most fishes have an...
...aquatic osteichthyes varies. Most species are oviparous,...
...One of the most significant events in...
...and feet. The most significant characteristic of...
...of the fossils, most of these early...
...life. On land, most salamanders walk with...
...Superficially resembling earthworms, most species burrow in...
...both are carnivorous. Most amphibians retain close...
...water and are most abundant in damp...
...humidity is higher. Most amphibians rely heavily...
...and oral cavity. Most amphibian species have...
...amniotic eggs of most amniotes have a...
...egg in air. Most mammals have dispensed...
...the lungs. The most recent common ancestor...
...in dry air. Most reptiles lay shelled...
...control body temperature. Most regulate their body...
...was diversifying. The most obvious derived character...
...Lizards are the most numerous and diverse...
...birds) alive today. Most lizards are relatively...
...articulated jaws enable most snakes to swallow...
...Turtles are the most distinctive group of...
...Modern crocodilians spend most of their time...
...stomach. A bird’s most obvious adaptations for...
...by feathers. The most famous Mesozoic bird...
...million years ago. Most birds can fly,...
...conical teeth of most reptiles, the teeth...
...number of lineages, most about the size...
...development and, in most species, completes its...
...the marsupium. In most species, the tiny...
...of derived characters. Most primates have hands...
...and ground-dwelling species. Most monkeys in both...

...as bath sponges. Most sponges are sequential...
...Cubozoa, and Anthozoa. Most hydrozoans alternate polyp...
...The medusae of most species live among...
...plankton as jellies. Most coastal scyphozoans go...
...and triploblastic development. Most bilaterians are also...
...also coelomates. The most recent common ancestor...
...million years ago). Most major groups of...
...are shared by most members of the...
...lophotrochozoans are the most diverse animal clade...
...to the outside. Most flatworms have a...
...are free-living, and most are marine. Planarians,...
...of hosts, and most species have complex...
...than 40 years. Most monogeneans are external...
...resemble plants. In most species of ectoprocts,...
...in the exoskeleton. Most ectoprocts live in...
...brachiopods are marine. Most live attached to...
...octopuses and squids. Most molluscs are marine,...
...soft-bodied animals, but most secrete a hard...
...visceral mass contains most of the internal...
...scrape up food. Most molluscs have separate...
...phylum. The four most prominent classes are...
...molluscs are gastropods. Most gastropods are marine,...
...of the body. Most gastropods are protected...
...in their wake. Most gastropods use their...
...gills found in most aquatic gastropods, the...
...and gas exchange. Most bivalves are suspension...
...the excurrent siphon. Most bivalves live rather...
...the Cretaceous period. Most squids are less...
...M. hamiltoni spend most of their time...
...in the sea, most freshwater habitats, and...
...function as gills. Most polychaetes are marine....
...Ecdysozoans are the most species-rich group. The...
...are among the most successful and abundant...
...are among the most widespread of all...
...are found in most aquatic habitats, wet...
...are separate in most species, and fertilization...
...The zygotes of most nematodes are resistant...
...is known about most species. The soil...
...Arthropods are the most diverse and abundant...
...have been described, most of them insects....
...regarded as the most successful animal phylum....
...touch and smell. Most sense organs are...
...for gas exchange. Most aquatic species have...
...sensory antennae, and most have simple eyes...
...liquid meal. In most spiders, gas exchange...
...generally internal. In most species, sperm cells...
...the lives of most other terrestrial organisms....
...thrive on land, most crustaceans remain in...
...of the hemolymph. Most crustaceans have separate...
...pore during copulation. Most aquatic crustaceans go...
...groups of crustaceans. Most isopods are small...
...the carapace. Although most decapods are marine,...
...are among the most numerous of all...
...Sea stars and most other echinoderms are...
...hard calcareous plates. Most echinoderms are prickly...

...and muscle tissue. Most animals reproduce sexually,...
...life cycle. In most species, a small...
...vertebrates, insects, and most other animals, Hox...
...to explain why most animals are not...
...of their bodies. Most sponges lack symmetry....
...the muscles and most other organs between...
...arthropods to vertebrates. Most triploblastic animals possess...
...grades, not clades. Most animals can be...
...determined very early. Most deuterostomes undergo radial...
...of the embryo. Most deuterostomes show indeterminate...
...the archenteron. In most bilaterians, a second...
...feature radial symmetry. Most animal phyla belong...

...fungi. Concept 28.1 Most eukaryotes are single-celled...
...group of eukaryotes. Most protists are unicellular,...
...Protists are the most nutritionally diverse of...
...exclusively asexual, but most have life cycles...
...a monophyletic taxon. Most diplomonads and parabasalids...
...the foundation of most marine and many...
...are fully heterotrophic. Most dinoflagellates are unicellular,...
...called the apicoplast, most likely of red...
...red algal origin. Most apicomplexans have intricate...
...the expression of most of the parasite’s...
...the flagella. In most cases, a “hairy”...
...supporting an elephant. Most of the year,...
...cells by phagocytosis. Most golden algae are...
...the largest and most complex protists known....
...are multicellular, and most species are marine....
...and freshwater environments. Most live in sand...
...algae are the most abundant large algae...
...or on land. Most red algae are...
...chlorophytes and charophyceans. Most of the 7,000...
...have been identified. Most chlorophytes live in...
...qualify as seaweeds. Most chlorophytes have complex...
...asexual reproductive stages. Most sexual species have...
...the charophyceans, is most closely related to...
...and marine environments. Most gymnamoebas are heterotrophs...
...in ecological relationships. Most protists are aquatic....