What is an organism’s niche?

a. the physical environment of the organism
b. the role that an organism plays in the environment
c. the traits that increase an organism’s survival
d. the competitors and predators of the organism

Which of these is a major trend in land plant evolution? a) the trend toward smaller size b) the trend toward a gametophyte-dominated life cycle c) the trend toward a sporophyte-dominated life cycle d) the trend toward larger gametophytes

An easy way to calculate the amount of energy available at each level is to what?

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing