Each member of a class sampled a piece of PTC testing paper. Thirty people sampled the chemical.

Twenty persons were tasters. How many had heterozygous genes?

10

20

0-20

indeterminate

What is a currebt ecample that provides evidence of natural selection?

Living things cannot come from nonliving things. This statement supports which part of the cell theory? A) cells are the basic units of life B) all cells come from pre-existing cells C) all organisms are made up of 1 or more cells

Two factors which cause global climate change are listed below. Factor 1: Habitat loss Factor 2: Earth's axial tilt Which of these statements is correct about the two factors which cause global climate change?

How do tumors form as a result of errors in mitosis

Why does the warm air rise up and over the cold air at a cold front

Two Differences between plant cells and animal cells

How do ATP and ADP differ in number of phosphate groups?

What is the final electron acceptor in aerobic respiration

Which texture best describes an igneous rock that formed deep underground?

What is the relationship between the size of a predator population and the size of a prey population?