Why is the heart able to act as one unit? why can all of the cells contract at the same time?

Animals such as pronghorn antelope, bison ans badgers dot to the landscape. where are these animals located?

There are specialized producers that live in warm water vents deep in the ocean. these producers do not per-form from photosynthesis, but instead perform a similar process with iron and other chemicals. why do you think these producers use this process instead of photosynthesis?

One of the purposes of transcription is to produce a sequence of bases that