In a survivable cold environment, an ectotherm is more likely to survive an extended period of food deprivation than would an equally sized endotherm because the ectotherm is using a little amount of its energy for temperature regulation.<span />
Plankton
these are microscopic eukaryotic organisms the often float at the surface of the ocean
Circulatory system. This includes blood.
Answer:
you voice echoing back when you shout in a canyon
Explanation:
I think A) but not really a lot of info