Question

In a forest ecosystem, a species of bird was introduced. The birds had few predators, and for a period of time its population rose steadily and then roughly leveled off. Which of the following conclusions provides the best explanation for this phenomenon?

A predator of the birds entered the ecosystem, causing the bird population to level off.

Migration of birds into the ecosystem began to decline, and emigration began to increase.

Another species of bird was introduced, and the two species competed for nesting sites and food.

The ecosystem reached its carrying capacity, and was not

Answer 1

Similarly, a competitor would most likely cause the bird population to decrease. So that leaves migration/emigration and carrying capacity. There is no reason given that rates of immigration and emigration should change, and that doesn't account for rate of births and deaths, so that can't really explain population leveling off. For the remaining choice, look up logistic growth curve or carrying capacity - logistic growth curves level off when populations reach K, the carrying capacity.

Answer 2

So what would be the answer tho haha

Answer 3

Idk found it off google thought it would help lol

Answer 4

haha trueee. hmmmm. i am confuseddd haha

Answer 5

@Calliope help

Answer 6

^^ They are good. lol

Answer 7

yes

Answer 8

@Calliope once again help

Answer 9

uhmmmm

Answer 10

its the last one , because the ecosystem couldn't support the number of birds that were there .

Answer 11

thanks soo much !

Answer 12

no problem(: