When is an atom stable? When it has a full outer orbit.

When it has the same amount of electrons as protons.

When it has no neutrons.

When it has an odd number of valence electrons.

What's a cell membrane?

Describe why carbon is the key element in forming structural components of cells. Discuss carbon's atomic structure in your answer.

There are two parts of photosynthesis-the light reactions and the dark reactions. What is the end product of the dark reactions

What is the liver an example of? a. a cell b. a tissue c. an organ d. an organ system A heterotroph is an organism that a. is a carnivore. b. makes its own food. c. eats only other species. d. gets food from outside itself.

Use the pedigree on the right to determine which of the following are possible genotypes for Irene. A. XHY B. XHXh C. XhY D. XHXH

A human nose is capable of detecting how many basic odors? a. 20 b. 40 c. 49 d. 50

Why is a control necessary to have when designing an experiment?

Why are there many separate ecosystems in a rainforest

Describe several ways in which the cheek epithelial cells differed from the potato, tomato, and onion cells? be specific

Which of the following is an example of human capital? People investing money into technology. The investment in education and training for people. Humans migrating to where their talents are needed. People who educate others on how to invest.