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From Our Gallery
Enhance your visual learning  Download and share pictures with your free membership.
What better way to learn than with access to over 35,000 diagrams, photos, and illustrations.
 382
Frog
 1104
Phobos in color by Mars Reconnaissance Orbiter - HiRISE
 494
The cascade of events by which the stroke-induced release of glutamate kills neurons.
 158
Alcohol metabolism
 322
Sketch of Euglena gracilis
 412
Valves in veins prevent the backflow of blood
 431
Spore Bearing Structures of Pilobolus
 281
Oligodendrocytes
 1234
The Structures of the Retina
 449
Adaptive Immunity
 349
Overview of transcription and translation
 16
Types of mutations
 3765
Actions of flexors and extensors.
 541
Hydrostatic Skeleton: Earthworm
 420
Embryonic development of shepherd’s purse (Capsella), a eudicot
 240
Bacteriophages
 565
Micrograph and graphic of a motor neuron
 496
Three Types of Neurons
 341
Morphological divergence among vertebrate forelimbs
 372
Ionotropic receptor
 691
Miranda
 528
Nonanthropoid Primates: Lemur
 6416
Tooth Anatomy
 983
All human organ systems and their functions (Part 1)
 725
Trichomes are hairs or other fine outgrowths of epidermal cells
 409
Amniote Eggs: Snakes
 527
Pollen on stigmata - blanket flower (Gaillardia grandiflora)
 2631
Chromosome territories in the cell nucleus
 313
Mutations in the Beta Globin Gene
 389
Genetically Modified Pig
 402
Sympatric Speciation in Wheat
 365
Plant Organs of a Flowering Plant
 1615
Hypersensitive Response
 4786
A closer look at the reproductive cycle of human immunodeficiency virus (HIV)
 4948
Reaction against infection
 490
Insect Body Plan: Grasshopper
 317
Red Algae
 539
The periodic table and its creator, Dmitry Mendeleyev.
 646
A model of the 70 ribosome, with mRNA and tRNA bound
 629
Reorganization of the rat motor cortex following transection of the motor neurons that control ...
 425
Inflammation
 419
An 8-week-old fetus
 20
Exposure pathways
 492
Scorpion
 149
Activation Energy
 1326
Bullet Ant
 574662
Insect Spy Drone
 11194
Examples of epithelial tissue.
 576
James Watson and Francis Crick’s metal-and wire model of DNA
 571
Major muscles of the human musculoskeletal system
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Diffie-Hellman Key Exchange Protocol (Step-by-Step) #cryptography
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Solving a System of Linear Equations Graphically
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What are the two main types of general-purpose sealers?
Quiz Me
The sixth graders in Mrs. Marsh's class are well aware of the rules and procedures that were established the first week of school. Now, in the fifth week of school, Mrs. Marsh expects students to comply and cooperate with minimal correction....
Quiz Me
A buildup of yellow ________ inside the engine results from the oxidation of oil.

▸ sludge

▸ *
Quiz Me
An electric cooling fan assembly and radiator cannot be removed together.

▸ true

▸ false
Quiz Me
What's the correct obverse of "All donuts are cookies"?

▸ Some cookies are donuts.

▸ All donuts are non-cookies.

▸ No donuts are non-cookies.
Quiz Me
Calculate the accumulated value of $3000.00 at 8% compounded quarterly for fifteen years. How much of the amount is interest?
Quiz Me
A researcher establishes a new test of intelligence and establishes the test norms by administering the test to students at the university where he works. Other researchers and clinicians begin using the new test to measure intelligence in a variety...
Quiz Me
In which order should cylinder head bolts be removed?

▸ Starting with the shortest, then longest

▸ Starting with the longest, then the shortest

▸ Starting at the outside and working inward

▸...
Quiz Me
A very thin uniform rod, 2.40 m long and of weight 135 N, has a frictionless hinge at its lower end. It starts out vertically from rest and falls, pivoting about the hinge. Just as it has rotated through an angle of 55.0°, what is the downward...
Quiz Me
What must be observed when installing the timing belt or timing chain?

▸ Number 1 piston must be at BDC.

▸ This must be done before the cylinder head is installed.

▸ The alignment of the crankshaft in relation...
Quiz Me
An adaptive lighting system performs a self-test by ________ the headlights.
 
  A) Moving the lights up and down B) Moving the lights left and right
  C) Both A and B D) Neither A nor B
Quiz Me
The water temperature of a nonsterile vaginal douche should be
 A) 90 degrees F.
  B) 95 degrees F.
  C) 105 degrees F.
  D) 120 degrees F.
Quiz Me
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