6. The following atoms are all variations of the element carbon: 12C, 13C, and 14C due to differing

numbers of neutrons. What are these variations called?

A. Isotopes

B. Polynomials

C. Polymers

D. Isomers

Chapter 14 Lab: Using Human DNA to Identify Human Remains. What rule should they use to select a relative who's DNA could be used to try to confirm the identity?

List three observations that Darwin made during the Beagle's voyage.

The y-axis of a graph gives the units for the? A control variable. B dependent variable. C measurement error. D independent variable

What studies how traits are inherited though the interactions of alleles.?

Aldosterone stimulates the reabsorption of sodium while enhancing potassium secretion. select one: a. True b. False

Suppose you use a microscope to look at a cell from the leaf of a tree. What structure will you see that would not be found in a cell from your fingernail? A. mitochondria B. cilia C. cell wall D. ribosomes

Name the three energy roles that organisms fill in an ecosystem.

Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. True False

Which of the following are examples of the first specialized tissues?

Which structure of the trachea prevents it from collapsing inward and obstructing the air passageway?