Refer to the information in the last question. If A and B occur together, what will happen over many generations?

A group of students are studying a species of beetle. They find two things they think could be limiting the range: 1) the beetles are found in conditions where there is more water available and not in drier areas, and 2) beetles are absent from areas that have a certain species of bird but present where there are no birds. They set up an experiment using 4 different conditions in an area where the beetles are not found, using 30 replicates of each plot type: unaltered plots (dry, birds present) greater water availability (matching the areas where beetles are found) exclusion of birds, no water added greater water availability and exclusion of birds They introduce 200 beetles to each of their plots, and count the number of surviving beetles every week for four weeks. At the end of four weeks, they determine the % of the beetles that survived in each treatment. Their results are graphed below. What appears to limit the range of the beetles?

Which of the following would increase the carrying capacity (K) for a population? Choose all that are correct.

Based on the life table below, what can we conclude about the population? age class # survivors (Nx) survivorship (lx) fecundity (mx) mean births/year/original female (lxmx) 0 980 1 0 0 1 450 0.307143 1 0.307143 2 300 0.255102 1 0.255102 3 130 0.112245 1.5 0.168367 4 70 0.071429 1.5 0.107143 Based on these data, the population is [a] because [b].

A plant is eaten by an herbivore. After being eaten, the plant produces a toxic chemical in the remaining leaves and in new leaves that it produces. The toxic chemical deters the herbivore from eating the plant. This is an example of ______.

Below is a simple aquatic food web. F and G are primary producers. If a predator of species A were introduced, this would cause species C to [a]. Introducing a predator of species A would be expected to [b] the NPP of this system.

A species of crab feeds on a species of snail by smashing their shells. Thin and thick shelled snails provide equal nutritional value, but the thick shelled snails are harder to break open and take significantly longer for the crab to eat.  Currently, there are large numbers of shells of all thicknesses. Based on optimal foraging theory, we would expect that crabs will _______.

diameter seeds eaten when occurring alone diameter of seeds eaten when with other species species A 6mm – 15mm 11mm – 15mm species B 2mm – 10mm 2mm – 10mm What is true of the species fundamental and realized niches? Species A’s fundamental niche is [a] its realized niche. Species B’s fundamental niche is [b] its realized niche.

In an experiment that tests the effect of soil nutrient availability and light on plant growth, which of the following would be the most appropriate control group?

There are several greenhouse gases that contribute to climate change. Carbon dioxide is one of the most important because it has increased dramatically since the start of the industrial revolution. How does carbon dioxide contribute to climate change?