One of the world's largest fossilized forests is found in northern Arizona. Today, the area is a very dry desert, but we know that dense forests are able to grow only in moist climates.

What is a gene ? a) a section of a protein that codes for dna. b) the alternate version of a trait. c) the visible trait in the f1 generation. d) a section of dna that codes for a specific trait .

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. once a virus gains entry into the body, it invades a host cell in order to? a. synthesize antibodies for defense b. deactivate the host cell's defenses c. access cell processes for reproduction d. metabolize host proteins and grow