During which stage of development is the egg fertilized by the sperm and the zygote undergoes cleavage?
Answer: Pre-embryonic period
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A pH of 6 is ____ times more ____ than a pH of 2
a. 3; acidic b. 4; acidic c. 3; basic d. 10,000; basic e. 40; basic
An asteroid that impacted Earth about 66 million years ago is believed to be responsible for ____
a. the creation of life on Earth b. a global catastrophe that may have wiped out the dinosaurs c. the splitting of one land mass into continents d. a mass extinction of land plants e. the evolution of Earth’s oceans
The stronger the stimulus, the larger the receptor potential
Indicate whether the statement is true or false
Spawning depends on
A) the synchronized release of eggs and sperm into the water. B) copulation. C) the release of a spermatophore into the water. D) internal fertilization. E) asexual reproduction.