Answer:
In the deep ocean layers where the sunlight does not reach, these organisms that are chemoautotrophic use sulfides from the hydrothermal vents to perform chemosynthesis instead of photosynthesis.
Explanation:
Chemoautotrophic organisms are the ones that are adapted to the absence of sunlight. Such organisms identify electron donors in their vicinity and derive energy from the oxidation reactions that these electron donors (mostly, inorganic compounds) undergo.
The major reason for the development of such a trait in these organisms is the depth that they live at. On deep-sea floors, there is an abundance of sulfides. Thus, the organisms living on there make use of the sulfides to fix carbon and obtain energy the required energy to sustain.
The process of chemosynthesis occurring on deep-sea floors due to the presence of carbon, sulfides, and oxygen culminates in the production of organic materials as an end result which the organisms feed on and sustain even when there is no sunlight available. These organisms majorly belong to the bacteria species called Archaea and Extremophiles.
Answer:
rapid and significant human changes.
Explanation:
The movements of people from rural to urban areas has accelerated, and the growth of cities in the developing world especially is linked to substandard living for many. Family disruption and social and domestic violence are increasing.
Answer:
The correct answer is A. People breeding dogs to be less aggressive.
Explanation:
Natural selection, according to Darwin, is the process by which species adapt to the environment, given certain pressures it might set upon them. The other choices refer specifically to a natural adaptation, such as bacterias becoming more resistant, birds' beaks changing and moths changing to darker colors. However, a person breeding a dog to be less aggressive is not an example of natural selection, given the fact that specific breeding is an artificial method, not relying on the natural changes to adapt to the environment.
Answer: 4 per m2
<span>To find out the population density of a certain
species, you must divide the number of organisms living in that habitat over
how big the area is. In this case, because there are 20 mice in an ecosystem
that is 5 square-meters big, then there would be 4 mice in every square-meter.</span>
