Which best characterizes the precambrian era?

a. abundant plants and animalsb. dinosaursc. small, one-celled organisms and primitive jellyfishd. extensive mountain building?

Which of the following is the largest of the bundles of tracts that connect the cerebellum to other parts of the brain? A : middle cerebellar peduncle B : arbor vitae C : inferior cerebellar peduncle D : superior cerebellar peduncle

5. What percent is the moon is always dark?

As plates move past each other, stress builds up. What happens when this stress becomes too much?

Which was the most likely food source for the terrestrial tetrapods?

Below is a list of possible challenges. Check all errors that you mentioned in your answer. Traits other than beak type might affect natural selection. It could take many generations to observe adaptions to a population.

How does random fertilization add to genetic variation? a) reshuffling of randomly picked up chromosomes b) random fusion of genetically unique gametes c) exchange of genetic material between homologous chromosomes

When the energy of a light wave is transferred to a particle and causes it to vibrate and generate heat, the energy of the light wave is what?

Which statements about a child with brown eyes must be true? Choose more than one answer

I observe that squirrels that live in the southeastern United States are much thinner than squirrels that live in the northeastern part of the country.

66) homologous chromosomes move toward opposite poles of a dividing cell during; a) mitosis.; b) meiosis i.; c) meiosis ii.; d) fertilization.; e) binary fission.