Some snake embryos have small buds resembling limbs. These buds disappear at later stages of embryonic development. These observations suggest that these snakes – a. will have offspring with limbs b. had a parent with working limbs c. have functional limbs as adults d. evolved from a limbed ancestor.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?

If the charge that enters each meter of the axon gets distributed uniformly along it. true or false