What is the unit of structure in the body?

The Chromosome

The Cell

Both 1 and 2

Regulates entry and exit of materials

Trace fossils can provide which type of evidence? Evidence that animals were never in that area. Evidence that animals were at some time in the area. Evidence that the climate was too hot for animals. Evidence that the area was once underwater.

Which class of polymers stores the most energy, gram for gram?

What is the cutest animal

6. What are the missing categories in the classification system that follows: kingdom, phylum, class, order, family,

Chimpanzees reproduce sexually, and sponges reproduce asexually. What disadvantage do chimpanzees have compared to sponges

What is the immune system? A. The group of cells and organs that protect the body from disease. B. A group of cells that undergoes apoptosis to protect the body. C. A group of organelles that digest particles that invade the cells. D.

Seth runs up 3 flights of stairs. the first climbs takes him 12 seconds. his second climb takes him 15 seconds. Has the power done been affected?

What is the best description of a molecule

What are Designer Babies? What are the pros and cons?