The fleshy edible portion of an apple is a(n)
A. seed.
B. embryo.
C. gamete.
D. ovary.
D. ovary.
Biology & Microbiology
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The sieve plate, stone canal, circular canal, and radial canals of a sea star are structures of the
(a) nervous system. (b) water-vascular system. (c) digestive system. (d) excretory system.
Biology & Microbiology
____ must have been the first eukaryotic cells
a. Archaea b. Bacteria c. Protists d. Fungi e. Microplants
Biology & Microbiology
Check all of the reasons that temperature is important for organisms.
A. It has a direct effect on blood cell production. B. It affects the fluidity and rigidity of plasma membranes. C. It affects the rate of biochemical reactions.
Biology & Microbiology
The nucleus of an atom contains
a. neutrons and protons. b. neutrons and electrons. c. protons and electrons. d. protons only. e. neutrons only
Biology & Microbiology