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kykrilka [37]
2 years ago
11

In 1983 a population of dark-eyed junco birds became established on the campus of the University of California, San Diego (UCSD)

, which is located many miles from the junco's normal habitat in the mixed-coniferous temperate forests in the mountains. Juncos have white outer tail feathers that the males display during aggressive interactions and during courtship displays. Males with more white in their tail are more likely to win aggressive interactions, and females prefer to mate with males with more white in their tails. Females have less white in their tails than do males, and display it less often. Based on the information given above, which of the following types of selection was most likely initially involved in the evolution of white outer tail feathers in juncos?
1. directional selection
2. stabilizing selection
3. disruptive selection
4. sexual selection
5. None of the above
Biology
1 answer:
Ivahew [28]2 years ago
6 0

Answer:

Sexual selection

Explanation:

Since males use the white in their tails during courtship to attract females and females prefer males with more white in their tails, there is a clear sexual selection process in which males with more white in their tails will have a greater reproductive success and leave more offspring and this trait will be selected for and each new generation the white in the male's tails will tend to increase.

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2 Points
alina1380 [7]

Answer:

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B. Worms consuming the blood from mammals.

Algae isn't causing any harm to the sloth, rather its providing it with camouflage to hide from predators. Both creatures benefits since the algae gets to eat any parasites and other things in the sloths fur, plus they get a free ride and home in the process. The sloth isn't harmed and is helped by the algae since it provides camouflage (mutualism).

Tree frogs aren't causing harm to the trees since they are only using them to hide from predators, the tree serves as protection for the frogs and aren't harmed in the process (commensalism).

Two fish protecting each other from predators aren't harming each other in any way, rather they are protecting each other from another animal that wants to eat them (mutualism).

The worms however are harming the mammals because they are consuming the mammals blood, this is parasitism since one animal is benefiting and the other is harmed.

Hope this helps! :)

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To learn more about thyroxine, refer: brainly.com/question/15557539

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