Which of these is an example of a chemical change?

A. Setting a piece of paper on fire

O

O

B. Melting iron into a liquid

C. Dissolving salt in water

O

O

D. Breaking a piece of plastic in half

Definition: This structure provides support and protection for plant cells. Term:

What model can be used to trace genetic inheritance

to function on their own unicellular organisms must do what? A) make tissues B) perform a specialized task C) work with other cells or d) do all jobs for survival

True or false: student loans often don't require you to start paying them back until after you've completed the course (s). a. true b. false

Stars are objects in space that produce their own heat and light. Where would the greatest number of stars be found? A. in a galaxy B. in a solar system C. in an asteroid belt D. in a meteor shower

1. Suppose that xylem were located only in the roots and stems of a plant. Would fluids in the xylem still move? Explain.

What activity will decrease body temperature? Sweating Exercising Adding clothing Shivering

Organisms with true radial symmetry A. tend to be highly mobile. B. do not have a distinct head region and tend to be sedentary or passive drifters. C. can be divided into two matching halves along only one plane. D.

1. The Earth's carbon cycle consists of the flow, cycling, and recycling of all of the carbon on the Earth. Every living organism's composition includes the element carbon. How does carbon become part of living organisms?

Which of these is used to find the precise age of a rock? Index fossils Radioactive dating Relative dating Stratified rock layers