What is it called when changes occur in an ecosystem that already exists? *

a. primary succession

b. secondary succession

c. pollution

the first 22 pairs of chromosomes are homologous in a normal person is that always true for the 23rd pair of chromosomes?

Bioethanol is an example of plants being used for what function? A. Food B. Clothing C. Medicine D. Fuel

Which of the following statements about cardiac muscle are false: a. Cardiac muscle depends on neural input to initiate the cardiac cycle. b. Cardiac muscle has shorter T-tubules than skeletal muscle. c.

Which of the following is NOT among the risk factors for coronary heart disease that can be minimized by behavioral change? A) Inactivity B) Smoking C) Heredity D) Hypertension

What is the difference between climate and weather? If you're not sure, take a guess.

In the nuclei or mitocandria

Whenever biological organic compounds, such as proteins and carbohydrates, are broken down or synthesized ...

What is the monomer of a carbohydrate

Jill has found evidence that suggests that individual volcanoes produce igneous rocks with a certain chemical signature. She predicts that scientists could use an igneous rock's chemical signature to determine where the rock came from.

Which best describes dynamic equilibrium? There is a difference in concentration on either side of the cell membrane. There is an uneven distribution of particles inside and outside the cell.