The widening of blood vessels is
A. vasoconstriction.
B. cardioconstriction.
C. vasodilation.
D. cardiodilation.
E. constriction.
C. vasodilation.
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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.
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
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
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)