Question

natural selection scenarios: you do alone page 78 directions: read each situation. decide whether it is a case of overproduction, competition, or variations. some situations may involve one or more causes. circle your decision and explain your reasoning. 4. a species of road runners nest in the hollowed - out bases of cactus plants. in one area of the desert, land developers have bought the land and have removed most of the old cacti. only the road runners who are the best nest - builders are able to survive. overproduction variation competition explanation: 5. a group of frogs live in a lake. the mother produces hundreds of baby tadpoles each time she reproduces. many of these tadpoles do not survive. however, of the ones that do survive, they can have many different lengths of tongues as adults. overproduction variation competition explanation: 6. a black widow reproduces hundreds of babies at one time. some of the babies can make much stronger webs than the other spiders. a new type of insect moves into the area that is much larger than the other flies. the new insects can easily break the webs of most of the spiders. however, the spiders who spin the stronger webs are able to catch the new insects. overproduction variation competition explanation:

Explanation:

Question 4

The removal of cacti reduces nesting sites. Road - runners compete for the remaining sites, and those with better nest - building skills (a variation) are more likely to survive. So it involves both competition and variation.

Question 5

The mother frog producing hundreds of tadpoles is overproduction. The different tongue lengths in adult frogs are a form of variation. There is no clear indication of competition in the given information.

Question 6

The black widow producing hundreds of babies is overproduction. The ability of some babies to make stronger webs (a variation) gives them an advantage in catching new insects, and there is competition among spiders for food resources. So it involves overproduction, variation, and competition.

Answer:

Question 4

Competition, Variation

Question 5

Overproduction, Variation

Question 6

Overproduction, Variation, Competition