Q1.3. Four snake species colonize an island at the same time. The species are bi

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Q1.3. Four snake species colonize an island at the same time. The species are biologically identical in every way and the island is habitable to them. If nothing changes, which of the following options is most likely to happen over time? O All four species will coexist because they will divide up the prey on the island. O All four species will go extinct because they have identical niches. O One species will develop a new realized niche and survive while the others go extinct because of competition. O One species will persist, but we cannot predict which one, the others will go extinct because of competition. Submit Q1.4. If four different snake species with identical food and habitat niches colonize an island at the same time, and one is better able to detect and acquire food than the others, which of the below options will most likely happen over time? The species best able to detect and find food will compete with the others, causing them to occupy smaller realized niches O The species best able to detect and find food will outcomhete the other snakes; it will eliminate the others via competitive exclusion OAll four species wil coexist because they will all acoupy smaler realized niches due to competition O One species will persist, but we cannot predict which one, the others will go extinct because of competition ubmit Q1.5. Kangaroo rats are endemic to the deserts of the American southwest. In one region, two kangaroo rat species eat only seeds and are biologically extremely similar. The two species are found in adjacent habitats. Seeds are abundant in both habitats, but less nutritious than insects If you were to double the amount of seeds across both habitats and add insects as potential food, which of the following outcomes would most likely result? O One species will change its food preferences to eat insects and the two species will coexist across both habtats O Because of the abundance and diversity of food available, both species will coexist across both habitats O Both species will switch their diets to the more nutritious insects and one will exclude the other from both habitats O No change will occur, the abundance and diversity of resources does not determine the ultimate outcome of competition if niches remain the same Submit

Explanation / Answer

3) Four snake species colonize an island at the same time. The species are biologically identical in every way and the island is habitable to them. If nothing changes, which of the following options is most likely to happen over time?

D) One species will persist, but we cannot predict which one; the others will go extinct because of competition

4) If four different snake species with identical food and habitat niches colonize an island at the same time, and one is better able to detect and acquire food than the others, which of the below options will most likely happen over time?

B) The species best able to detect and find food will out-compete the other snakes; it will eliminate others via competitive exclusion

5) Kangaroo rats are endemic to the deserts of the American southwest. In one region, two kangaroo rat species eat only seeds and are biologically extremely similar. The two species are found in adjacent habitats. Seeds are abundant in both habitats, but less nutritious than insects. If you were to double the amount of seeds across both habitats and add insects as potential food, which of the following outcomes would most likely result?

D) No change will occur; the abundance and diversity of resources does not determine the ultimate outcome of competition if niches remain the same

6) A third species of kangaroo rat is introduced into the habitats of the two species from Question 5. If this third species is biologically similar to the first two, but also eats insects, which of the following will most likely happen?

C) The new species will out-compete the other two because it has a broader food niche and can take advantage of resources that the other two cannot.

7) If, over evolutionary time, one of the two kangaroo rat species from Question 5 (without a third species present) were to evolve a change in food habits such that it eats only insects. Which of the following would most likely happen?

C) Both species would share both habitats because their niches would be different and competition would thus be eliminated.

8) Two species of bats colonize an island at the same time. There are similar numbers of moths and beetles on the island, but no other bats. The only difference between the bat species is foraging ability; one is more efficient at catching beetles, and the other is more efficient at catching moths. Which of the below choices will most likely happen over time to the two bat species on the island?

D) The two species will coexist by occupying different realized niches

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