Which trait is most likely to be acted on by natural selection?

A.

the knowledge that a person learns in school

B

the tricks a dog knows how to perform

C

the length of bird's beak

D

the size of a weightlifter's arm muscles

An organ system consists of a group of organs that performs specific functions necessary for the survival of an organism.

What can be assumed about the parent cell if, after asexual reproduction, the daughter cell has 24 chromosomes? A) The parent cell has 12 chromosomes. B) The parent cell has 24 chromosomes. C) The parent cell has 48 chromosomes.

DNA contains all of the genetic information for a cell and is often called?

The main source of energy for wind and ocean currents on Earth is

The cell wall of a plant is like a laminated two layer structure. a. True b. False

The relative location of four genes on a chromosome can be mapped from the following data on crossover frequencies Genes B and D Frequency of Crossover 5% Cand A 15% A and B 30% C and B 45% Cand D 50% Which of the following represents the relative

How can we use rocks to determine how an area used to look in the past?

What type of bonds connect the deoxyribose sugars to the phosphate group?

What are proteins made up of?

What are at least 5 important words associated with the water cycle? What do they mean? Why are they important?