Scientists believe that over 99% of species that once existed on Earth are now extinct.
D. over 99 percent
Answer:
Explanation:
A( Gravity) because, When an object falls through space, towards Earth, it experiences positive acceleration due to the force of gravity. The acceleration due to gravity is 9.8m/s2.
Answer:
Planktons
Explanation:
Microscopic plants known as planktons are found near the surface of marine biomes.
These planktons are producers for all life forms in the marine ecosystem. Without them, other life forms thriving in such biomes would be near impossible.
These planktons are capable of carrying out photosynthesis by which they manufacture their own food from inorganic materials in the environment.
Answer:
The coral reefs, mangrove forest, and salt marshes are disappearing due to pollution, over exploitation by humans, and climate change.
Explanation:
Corals are aquatic animals. They form calcium carbonate deposits in the shallow seawater which becomes coral reefs. The corals feed on bacteria, algae. The coral reef provides a microenvironment for many aquatic fishes, plants, and animals. The coral reef acts as the keystone species of the aquatic habitat. That's why they are important for the survival of different aquatic life. The human activities like overfishing, marine pollution causes the degradation of coral reefs. The pollution kills many algae, bacteria, which are the foods of corals. Therefore, they die.
The mangrove and salt marshes are present near the coast. They live in saline waters. Mangrove provides a protective environment by preventing sea tides, home for many organisms.
The salt marshes are formed due to the accumulation of sea salts, and soils in the coastlines. They are seen also at river banks. The salt marshes are provided with grasses. It helps in soil fertility and provides habitat to different organisms.
Both the salt marshes and mangroves forest destroys by over-cultivation, aquaculture, and industrialization near the coast. The construction of dams also damages the mangrove and salt marshes. Mangroves are cut down for timber, fodder purposes. Pollution and climate change also the major cause of the disappearance of this ecosystem.
Answer:
<u><em>Hawk </em></u>
Explanation:
Biomagnification can be described as the accumulation of substances like toxins, pesticides etc in tolerant organisms. The biomagnification tends to increase as the trophic levels of a food chain increase. This is because these substances get more and more accumulated as they move up a food chain.
In the example of the food chain mentioned in this question, the highest trophic level is of hawks, so they will be subjected to the greatest biomagnification.