To cross the synapse requires the actions of found at the tips of axons.

1.cell bodies
2.dendrites
3.neurotransmitters
4.none of the above

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome

Which of the following is a testable hypotheses?