What is the most difficult part of a controlled experiment?

1.) testing only one variable

2.) testing two variables

3.) testing multiple variables

4.) testing zero variables

If each parent can produce 100 genetically distinct gametes, how many genetically distinct offspring can two parents produce? a. 10,000 b. 1,000 c. 200 d. 100

Magma that cools very slowly deep beneath the surface forms minerals with what type of crystals? a. small b. large c. very hard d. cubic

A person has taken several different drugs at the same time. The signals the person exhibits appear to be an exaggerated effect of what is expected from any drug taken alone.

Which describes a grizzly bear's habitat? all the biotic factors in the ecosystem all the abiotic factors in the ecosystem the role of the bear in the ecosystem the physical area where the bear lives

Primitive anaerobic prokaryotic cells did not contain which of the following? A) mitochondria B) DNA C) cell membranes D) RNA

Which of the following are characteristics of heterogeneous mixtures? distinguishable components evenly distributed components particles too small to be seen with a microscope components in varying proportions particles that may settle

You have a yellow pea, but you do not know if it is heterozygous (Yy) or homozygous. When you perform a test cross to a green recessive pea (yy), you observe that half the offspring have yellow peas and half have green peas. What can you conclude? a.

Compare and contrast Uniformitism and Catatrophism

The study of nervous co-ordination of endocrine system is known as?

What is the name of the classification system that we still use today