What is a plasma?

A. A superheated gas

B. A partly melted solid

C. A liquid in which the atoms move back and forth

D. A gas where the atoms are in fixed positions

Which of the following statements about adaptive radiation is correct? a. Adaptive radiation occurs very slowly over time. b. Adaptive radiation occurs within a single lineage. c. Adaptive radiation occurs in the presence of competitors. d.

Flatworms, crabs, and starfish may all be classified as

An isotope is an atom of an element that varies in mass number due to variation in the number of: A. atoms. B. protons. C. neutrons. D. electrons.

soil erosion can increase when humans remove trees and other vegetation from an area. what is this process called?

A plant breeded found a species of flowering plant with very attractive flowers growing wild in a field and she thought it woud appeal to her customers. Some of the plants of this species had red flowers, some white flowers, and some pink flowers.

What information do viral genes contain? A. directions for producing cellular proteins B. instructions for making more viruses C. instructions for DNA synthesis D. directions for invading the host cell

To conduct a phylogenetic analysis, we need an outgroup to: A. decide which characters are analogous and which are homologous. B. determine which character states are ancestral and which are derived. C.

Only homologous characters are useful in constructing phylogenetic trees. True or False

Evidence suggests that the earliest stone tools of early Homo were important for: a. protection from other hominid species b. the systematic hunting and killing of large animals (such as dinosaurs) c.

A stuffed toy with a mass of 0.900 kilograms sits on the edge of a bed at a height of 0.830 meters. If the toy falls off the bed, what will its mechanical energy be at a height of 0.500 meters? (Ignore frictional effects.) A) 0.0 J B) 3.6 J C) 7.