A long-term relationship between two species that usually involves an exchange of food or energy is

Cells are the basic (blank) (blank) of our bodies

13. a liver cell and a nerve cell in you body has the same dna. why does the liver cell have different structures and functions than a nerve cell?

Information obtained from experiments must be: recorded memorized previously known

Name one reason scientists believe that all life envolved from a single common ancestor

Potentially, using the genetic code as it exists, nature could have used 63 amino acids. Why do you think it only uses 20?

The ability of an enzyme to change shape when it binds to its substrate is called

Describe how a scientist using the phenic system would classify an organism.

A student made a model of an ecosystem inside a sealed plastic bottle. She placed soil, rocks, water, plants, and animals inside the bottle. How is the model different from a natural ecosystem? A. The model lacks producers. B.

The scientific name of an organism is formed from what two parts of the organism's classification?

If the women does not get pregnant, then the corpus breaks down and the level of progesterone stars declining. Once progesterone decreases what happens to the lining of the uterus?