What is true of mass extinctions?

A All life on Earth dies when a mass extinction happens

B In each mass extinction, over 50% of animal species died.

C Mass extinctions happen frequently.

D There is no evidence for past mass extinctions.

The process carried out by yeast that causes bread dough to rise is

The goal of basic science is: a. to use technology to improve quality of life b. to solve a particular problem. c. to improve a specific situation d. to increase our understanding of general principles

Which type of leukocyte would increase rapidly during an allergy attack or infection by a parasitic worm?

Explain 2 reasons why we can conclude that the rise of the water in the

Which best describes the brain stem? A) The brain stem is found in the midbrain B) the brain stem controls critical thinking C) The brain stem controls blood circulation D) the brain stem regulates the release of hormones

Name three characteristics of the cells that make up the muscle tissue in the heart.

Creationists criticize the idea of natural selection as a circular argument, or tautology, claiming "The fittest are those that survive, and survival is how fitness is defined." Why is our definition of natural selection not tautological? a.

Atoms combine to form what? A. elements b. proton c. molecules

A blastocyst is a group of cells that forms after a human egg is fertilized. The blastocyst consist of two types of cells. Some of these cells develop into all of the cells of a growing fetus. What do the other cells develop into? A.

Select the atoms that are likely to lose electrons to form cations: A. Iodine (I) B. Lithium (Li) C. Bromine (Br) D. Potassium (K)