The widening of blood vessels is

A. vasoconstriction.

B. cardioconstriction.

C. vasodilation.

D. cardiodilation.

E. constriction.


C. vasodilation.

Biology & Microbiology

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Early animal embryos are composed of stem cells, unspecialized cells that are capable of dividing and renewing themselves for long periods

If a stem cell divides by mitosis so that one cell eventually becomes part of the brain and the other cell becomes part of a salivary gland, the cells have A) differentiated. B) diffused. C) taken up genes from surrounding cells. D) lost genes. E) increased their genetic variability.

Biology & Microbiology

Many male songbirds have very distinctive songs that are used to attract females. These songs are an example of a ________ isolating mechanism.

A. postzygotic, mechanical B. postzygotic, ecological C. prezygotic, gamete fusion D. prezygotic, behavioral E. prezygotic, temporal

Biology & Microbiology

What is a buffer?

A. A substance that releases hydrogen ions in water B. A substance that accepts hydrogen ions in water C. A substance that accepts oxygen ions in water D. A set of chemicals that keep the pH of a solution stable E. A substance that releases oxygen ions in water

Biology & Microbiology

In ovoviviparity, the eggs, after being fertilized internally, are deposited outside the mother's body to complete their development.

Answer the following statement true (T) or false (F)

Biology & Microbiology