B.respiration
C.decomposition
D.building proteins
The correct answer is A.photosynthesis
In the process of photosynthesis plants use the energy of the sunlight and absorbed CO2 from the atmosphere to create simple sugars. In this process, plants also create oxygen molecules that are released to the athmosphere.
Human activities that involve burning fossil fuels cause a release of a huge amount of CO2 to the atmosphere. Photosynthesis in plants can reverse the effects of this, but only to a certain extent. This is, but all means, not enough to stop the global warning effect that the CO2 build-up in the atmosphere is causing.
Answer:The correct answer is -
A.photosynthesis.
Explanation:
Human activities such as burning of fossil fuels (like coal and oil) , clearing of forests can lead to the accumulation of CO2 (carbon dioxide) in the atmosphere, which affects the carbon cycle.
This can lead to many harmful effects like global warming (overall rise in the earth temperature).
These human interactions can be counteracted through photosynthesis.
Photosynthesis is a process of formation of food (glucose) in green plants and algae using CO2 and water in the presence of sunlight.
It releases oxygen in the atmosphere as a byproduct of this process.
The atmospheric CO2 can be reduced through photosynthesis and therefore, it can help counteract the given human activities.
Thus, option A) is the right answer.
Ice forms from the top of the water column down, creating a protective barrier over the liquid water.
The higher-density liquid water shelters organisms from cold air better than the less-dense ice.
The higher-density liquid water traps nutrients for primary producers better than the less-dense ice.
Answer:
The higher-density liquid water shelters organisms from cold air better than the less-dense ice.
Explanation:
Because of this difference in density, the waters of lakes and seas do not freeze completely because a less dense ice layer forms on the surface and creates a natural thermal insulator that makes the water below it remain in the liquid phase. This saves the animal and plant life of lakes and seas.
Ice works as a thermal insulator because its specific heat (2.03 J/g. ºC) is lower than that of water (4.18 J/g. ºC).
After the cold is over and the hot season comes, the surface ice melts easily. But that would not happen if the ice dropped to the bottom of lakes and seas. With this, the animal and plant life would be compromised.
Another important point is that, as already mentioned, liquid water reaches its maximum density at approximately 4ºC, which is 1,000 g/cm3. Therefore, during times such as spring and fall, the water reaches temperatures near this and becomes denser than the rest, going to the bottom. This causes a vertical movement called the convection current, which is responsible for mixing the nutrients dissolved in water.
The higher-density liquid water shelters organisms from cold air better than the less-dense ice.