When a cell of a plant stem divides, each new cell has . A. half the number of chromosomes as the parent cell
B. the same number of chromosomes as the parent cell
C. twice the number of chromosomes as the parent cell
D. four times the number of chromosomes as the parent cell

What noticeable trend from this graph might be used to make a conclusion?

What is a photon? a. part of a ribosome b. a light particle c. a carbon dioxide molecule d. part of a chloroplast b. a light particle

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.