Answer:
I. They produce many offspring in a short period of time II. They have very low survivorship early in life
Explanation:
The r-selected species are the ones who produce the maximum number of offspring as quickly as possible when the resources are abundant. The individuals of the r-selected species have a small body size and exhibit early maturity. They have a short life span and provide little or no parental care to the young ones. Therefore, the survival chances of the young ones in the early stages of life are very low.
These species are found in variable, temporary, or unpredictable environments. Some examples of r strategists are insects, such as mosquitoes, and common weeds, such as the dandelion that produce a large number of offspring as the favorable growth conditions arrive.
Options for the questions are not given. They are as follows :
A ) 1,2,3
B) 2,3
C)1 ,3, 4
D)1
E) 1 through 4
Answer:
C) 1,3,4
Explanation:
Some aphids make black walnut trees their habitat in the forest and only prefer to mate with aphids who have the same habitat. This is an example of reproductive isolation since these aphids now have different mating preferences and hence are isolated from rest of the aphids. The isolation occurred on the basis of difference in habitats so it is also an example of habitat isolation. Since the mating is prevented all together it is also an example of prezygotic barrier i.e. formation of zygote is inhibited. However, it is not an example of allopatric speciation since the aphids are not separated geographically from each other. They are present in the same area but have different habitat preference. Hence, option C is correct answer.
the is a definite article meaning that you cannot use it
"an" can only be used before words beginning with vowels
therefore the answer is" a"
Hippos are being endangered mainly because the poachers hunt them for their meat and their ivory teeth
The carrying capacity for a species in an ecosystem is primarily determined by the resources in the ecosystem.
<u>Explanation:</u>
The availability of food, raw materials, water and other resources in that ecosystem are those factors that is used for the determination of the carrying capacity. The factors such as nature, the levels of wastage accumulation, removal of very important things from the system also determines the carrying capacity. a system's carrying capacity may involve matters such as available supplies of food, water, raw materials, and/or other similar resources.
The main components that determines the carrying capacity of an ecosystem are food and other resources, provided, the humans must not disturb the ecosystem for their self survival. The resources limitations and their availability determines this factor to a greater extent.