Ques: Q: What begins when a neuron receives a chemical stimulus? Choices: - a induce impulse - a metabolism impulse - nerve reaction - a nerve impulse A:
Ans: a nerve impulse

Ques: Q: The shape of a virus is determined by the type and arrangement of proteins in its what? Choices: - enamel - anode - nuclei - capsid A:
Ans: capsid

Ques: Q: What 3 types of friction occur between solid surfaces? Choices: - static , arching , rolling - static,desending,sliding - static , ascending , rolling - static, sliding, rolling A:
Ans: static, sliding, rolling

Ques: Q: Most, if not all, of the extant animal phyla today evolved during the cambrian period, yet many of what devastating events have taken place since then? Choices: - life extinctions - earthquakes - starvations - mass extinctions A:
Ans:
mass extinctions