An ________ of a nerve cell is the temporary depolarization and repolarization of the cell membrane.
Fill in the blank(s) with the appropriate word(s).
action potential
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The anterior-posterior orientation of Drosophila embryos is initially controlled by ____
a. maternal effect genes b. gap genes c. pair rule genes d. segment polarity genes e. homeotic genes
As rainfall in an African savanna decreases, it would most likely change into
A. tiaga. B. desert. C. tropical rainforest. D. temperate forest. E. tundra.
Which hormones are secreted by the adrenal cortex, and regulate the ion balance of the body?
A. Corticosteroids
B. Glucocorticoids
C. Mineralocorticoids
D. Gonadocorticoids
What is the term for organisms in which internally-fertilized eggs are laid to develop and hatch outside the mother's body?
A. Viviparous B. Marsupial C. Ovoviviparous D. Placental E. Oviparous