Answer:
D.both A and B
Explanation:
because if there some option,like abcd and the letter d. is both a and b that is the correct answer.
The biological species concept proposed by Mayr states that a biological species is a population whose members can interbreed and produce fertile offspring.
<h3>What is the biological species concept?</h3>
The biological species concept is a model used in biology sciences to delimit a species through mating fertile features of the individual that belong to such species.
This concept (biological species concept) was proposed by Ernst Mayr to understand how each species represent a functional unit.
In conclusion, the biological species concept was proposed by Mayr and states that a biological species is a population whose members can interbreed and produce fertile offspring.
Complete question:
Fill the blank. The biological species concept proposed by ______ states that a biological species is a population whose members can interbreed and produce fertile offspring.
Learn more about the biological species concept here:
brainly.com/question/985104
#SPJ1
Answer:
To show the flow of energy through ecosystems, food chains are sometimes drawn as energy pyramids. Each step of the pyramid represents a different trophic level, starting with primary producers at the bottom. The width of each step represents the rate of energy flow through each trophic level.
Explanation:
Answer:
Environmental justice is the fair treatment and meaningful involvement of all people regardless of race, color, national origin, or income with respect to the development, implementation, and enforcement of environmental laws, regulations, and policies.
Explanation: During the Civil Rights Movement in the 1960s, activists participated in a social movement that created a unified atmosphere and advocated goals of social justice and equality. The community organization and the social values of the era have translated to the Environmental Justice movement
Answer: More than 99 percent of all organisms that have ever lived on Earth are extinct. As new species evolve to fit ever changing ecological niches, older species fade away. But the rate of extinction is far from constant. At least a handful of times in the last 500 million years, 75 to more than 90 percent of all species on Earth have disappeared in a geological blink of an eye in catastrophes we call mass extinctions.
Though mass extinctions are deadly events, they open up the planet for new forms of life to emerge. The most studied mass extinction, which marked the boundary between the Cretaceous and Paleogene periods about 66 million years ago, killed off the nonavian dinosaurs and made room for mammals and birds to rapidly diversify
