A contractile vacuole works just the same as the name suggests, in that it expands and contracts. The point of the contractile vacuole is to pump water out of the cell through a process called osmoregulation, the regulation of osmotic pressure. It occurs in freshwater protists, but mainly in the kingdom Protista as a whole.
From the 118 known elements, 25 elements are believed to be essential to human biology.
Out of 25 elements , 6 elements namely – carbon, oxygen, hydrogen, nitrogen, calcium and phosphorus , they make up about 99% of the human body. Some other elements like - potassium, sulfur, sodium, chlorine, and magnesium, they are also found in the human biology.
Answer:
D. The tubes allow water and nutrients to be transported throughout
the plant.
Explanation:
option D supports the description of the cells. The long , vertical tubes transport water and nutrients and are most likely xylem and phloem vessels.
option A is wrong since, chloroplasts inside the cell helps in absorbing sunlight.
option C is also wrong, because water loss is controlled by the stomata in the leaves and they are not long tubes.
option B could possibly be right but option D is better suited.
Answer:
The sun is classified as a star.
Explanation:
The sun is a star at the center of the solar system.
The sun is important in the following ways:
- The sun's light has to be present for photosynthesis to occur thereby, it enables food production by plants.
- The sun lights up the earth through its light rays.
- It warms up the sea.
- It provides heat for heating up the earth leading to production of water vapor that rises to form clouds.
- The sun also provides vitamin D that is essential to living organisms health.
The <span>companion cell i belive</span>
