The organs of the heart and the blood vessels form which of the followings?

A. a cell

B. a tissue

C. an organ

D. an organ system

Semisolid media such as MIO are used to determine motility. Another such medium such is SIM (sulfide, indole, motility) medium. When would you use SIM instead of MIO?

Laying eggs with shells allows reptiles to move into new environments. how?

Why cant blue color be evolved by living organisms

Which organism has a central brain? Flatworm, hydra, sponge, fish?

If each normal body cell of a human contains forty-six chromosomes, then the number of chromosomes in a human egg will be A) 23 B) 24 C) 36 D) 46

Why is the hormone oxytocin important?

Bacteria and fungi are important decomposers. however, which decomposition function is almost entirely the work of fungi?

What is the second step of the scientific method

A structure on a cell that binds with something, like a hormone is called a (n) A. catalyst B. protein C. receptor D. axon

Which statement is true? A. Lipids are a type of fat. B. Fats are a type of lipid. C. Fats and lipids are separate and unrelated substances. D. All lipids are fats, and all fats are lipids.