The first snakes evolved during the Cretaceous, from short-legged, long-bodied ____
a. lizards
b. birds
c. crocodilians
d. turtles
e. amphibians
a
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The atomic number of an element is equal to the number of:
A. protons plus neutrons. B. neutrons plus electrons. C. neutrons only. D. protons only. E. protons plus electrons.
Which of the following contains enzymes capable of digesting an egg’s protective coverings to allow a sperm to fuse with the egg?
a. acrosomal vesicle b. bulbourethral gland c. seminal vesicle d. prostate gland
What forms a long bone's shaft and the outer part of its two ends?
a. spongy bone b. periosteum c. osteons d. osteoblasts e. compact bone
Arbuscular mycorrhizae are characterized by all of the following features except
A. The fungus can associate with several species of plants. B. They are seen in the earliest vascular plant fossils. C. The fungal component is a glomeromycete. D. Fungal hyphae penetrate plant root cells. E. They are the most common mycorrhizal type.