The production of female gametes begins when a mass of tissue, called the ____, starts growing on the inner wall of
an ovary.
a. zygote
b. ovule
c. endosperm
d. carpel
e. stigma
ANSWER: b
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Microevolution involves ___
A. changes to the number of individuals in a population. B. changes in a population's gene pool. C. a change in the ratio of males to females in a population. D. the fixation of an allele over a long period of time.
Which class of genes controls the developmental identity of segments along the anterior-posterior axis?
What will be an ideal response?
Which of the following is true of nitrogen?
A. N2 is scarce in the atmosphere, therefore, plants must obtain other sources of nitrogen. B. Animals require nitrogen from the food they eat for the synthesis of carbohydrates and lipids. C. Nitrogen-fixing bacteria convert N2 into compounds plants can utilize. D. Nitrogen is plant food and, therefore, provides plants with energy.
Which of the following could be a valid scientific hypothesis?
A) Moray eels find their prey primarily by following chemical cues. B) All marine animals must have gills. C) It is immoral to keep dolphins in captivity. D) Dogs are superior in intelligence and swimming capabilities compared to seals.