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Contractile vacuoles in protist microorganisms:

An animal that has the hind limbs lengthened, thighs heavily muscled, possesses a long tail, fused cervical vertebrae and a shortened vertebral column is adapted for:

Which of the following is the most common compound in the cell walls of Gram-positive bacteria?

Which of the following are adaptations in animals for digging?

Organs, or parts of organs that are seemingly nonfunctional and degenerate, often undersized or lacking some essential part, are referred to as:

Which of the following molluscan structures enable them to move?

Xylem tissue in herbaceous plants may be found:

Important development(s) in the spread of plants from the water to land are:

A common plant in the understory of a forest that possesses a segmented stem, slender leaves arranged in a whorl and has imbedded silica crystals would probably be a:

Which of the following would NOT be characteristic of an animal such as a sea anemone, starfish or sea urchin?