Which activity can occur without the use of energy?

1.

contraction of muscle tissue
2.

protein synthesis in a cell
3.

active transport of minerals
4.

movement of water across a membrane

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 .

Research cheetahs on the internet what has contributed to this animal becoming "endangered" or "threatened." what animal you have chosen? -cheetah how long has the animal been endangered or threatened? what has contributed to this animal’s endangered or threatened status? why is it important to save this animal from extinction? after researching and gathering facts, write a 350-word letter from the point of view of an animal rights' activist. be sure to include at least five facts that you learned from your research.

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.