Which of these describes an example of a keystone species that scientists should make efforts to protect? A. More than 1,000 newly hatched wood frog eggs in a forest ecosystem.

B. A gopher tortoise that provides a home to more than 300 different species of animals in its burrow.

C. A nonnative population of lionfish living on a coral reef in Florida that have no natural predators.

D. A population of mistletoe plants that are parasitic because they depend on other trees and plants in the ecosystem in order to get what they need to survive.

"d.) carbon dioxide and hydrogen sulfide"

option c is the correct answer.

the contamination

we are putting to many trash.

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'