¿qué cavidades tenemos?

A grandes rasgos se puede decir que el cuerpo humano tiene tres cavidades: la cavidad dorsal, la cavidad ventral y la cavidad abdominopélvica, por lo tanto podemos decir que tenemos 3 cavidades que a su vez se subdividen en varias.

Explanation:

a. by using fur or clothes to trap heat energy near the body

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.