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

At its carrier sites a hemoglobin molecule can combine with? A: oxygen, carbon dioxide and carbon monoxide B: oxygen, carbon dioxide and nitrogen C: oxygen and carbon dioxide D: oxygen and carbon monoxide

Why is the number of trophic level restricted to four or five in a food chain?

Nucleus acids offer variability because they contain alternate forms of genes called

How do you think Earth's internal processes cause surface features on Earth as tall as Mount Everest?

Which of these is not an example of intracellular communication? A. DNA in a cell replicates B. Heart cells contract together C. Water regulation by a cell's central vacuole D. Charged ions distributed across a plasma membrane

Why was Marta so concerned about getting sunscreen on?

1. Which phrase best describes the term genome? a. the genetic makeup of a chromosome b. the genes that make up an organism c. the location of a specific set of genes d. the sum of an organism's physical traits Group of answer choices

How are intensity, sound, and energy are related

In order to understand the disease in Mr. Volpe's alimentary canal, one must know the layers that make up its walls.

What is an example of a molecule that would require facilitated diffusion to enter a cell?