12. A group of elements that has two electrons in its outer energy level is the

a. alkaline earth metals

c. alkali metals

b. halogens

d. actinides

A science student makes the following statement. Based on the data, we determined that plant growth is affected by the type of soil. What is the student doing? A. Making a prediction B. Forming a hypothesis C. Collecting data D. Drawing a conclusion

What evidence suggests the continents were once all together but then drifted apart?

The three domain system recognizes fundamental differences between the two groups of which one of these?

Term Definition 3. Carbohydrate a Molecule that's a source of energy in the body 4 Nucleic acid b. Many structures and enzymes in the body are 5. Lipids c Ore substance that makes up cel membranes 6. Proteins d.

Viruses and bacteria are both microscopic and can both cause disease. viruses differ from bacteria in that all viruses * a. have cell walls. b. can be destroyed by antibiotics. c. need a living host cell to reproduce.

Which lipid acts as a chemical messenger? a. adipose tissue b. cholesterol c. testosterone d. beeswax

The degradation of alanine yields pyruvate and the degradation of leucine yields acetyl coa. can the degradation of each of these amino acids directly replenish the pool of tca intermediates? explain why or why not.

How does the Arthropod growth curve differ from the growth curve of most other animals?

Which of the following microscopes has the lowest resolution TEM SEM dissecting electron

The process where sediments turn into a sedimentary rock through compaction or cementation is called