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Lelu [443]
2 years ago
9

____ is the species that plays an especially important role in its community so that major changes in its numbers affect the pop

ulation of many other species in the community
A. Prey
B none of the above
c predator
D keystone

please answer quickly and be 100% sure its correct
Biology
1 answer:
ipn [44]2 years ago
5 0

Answer:

D. Keystone

Explanation:

Think of it from a bridge building perspective the keystone in an arc bridge was the tip or the highest point if that stone was pulled out all of the other stones would fall out with it, same goes for ecosystems if that one species declines dramatically or goes extinct then the rest of the population will proceed to do so as well

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Olegator [25]
Peeing in a cup is required for a drug test
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3 years ago
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Jenny predicts that when water in a cup evaporates, the mass of the water and cup together will get smaller.
Elden [556K]

A.  Use a scale to measure the mass of a cup of water. Leave the cup out for one day and measure the mass again.

Explanation:

Jenny can predict is evaporation occurs by using a weighing scale to measure that mass of a cup of water, then he leaves the cup out for one day and he measures the mass again.

  • If the mass remains the same, then evaporation did not occur.
  • If evaporation occurs, then the mass will be lesser after the second measurement.
  • From this Jenny can infer the mass loss and made good deductions.
  • Evaporation is a phase change in which liquid turns to vapor.

Learn more:

Evaporation brainly.com/question/10972073

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4 0
3 years ago
Match the steps in the cell cycle in the correct order
Tcecarenko [31]

Answer:

1. Chromosomes line up - metaphase

2. Cell growth - G1

3. Final preparations for division - G2

4. Chromosomes get pulled apart - anaphase

5. DNA replication - S

6. Chromosomes condense - prophase

7. Chromosomes uncoil and nucleus reforms - telophase

8. The cytoplasm and organelles divide, and now there are two identical cells - cytokinesis

Explanation:

There are four primary phases, or stages, in the cell cycle, which is a systematic process. Each stage has a goal that has to be achieved before moving on to the next. G1, S, G2, and mitosis are the stages.
There is growth during the G1 phase. A lot of protein is produced and water is pumped in, increasing the volume of the cell. The DNA is also examined at this time to see whether there has been any damage. The G1 phase precedes the S phase, therefore before going into S phase, the cell must make sure it has enough energy reserves.

The cell duplicates its DNA during the synthesis phase, also known as the S phase. DNA content doubles due to the duplication of all chromosomes. The compact state of DNA is created by proteins, which do not exist in and of themselves. Therefore, in order to ensure that the new DNA is properly packed when DNA is replicated, new packaging proteins must be produced. Histones are the proteins that house DNA. The production of new DNA is closely linked to the production of new histones.

A cell multiplies its organelles during the G2 phase. Right before the cells divide into two distinct cells during mitosis, the G2 phase occurs. There must be distinct functioning organelles in each daughter cell. Organelles like the golgi and endoplasmic reticulum are linked networks of sizable membrane pouches that may change size. Other organelles, including mitochondria and chloroplasts, are separate structures that must separate similarly to how cells do.

The process of physically dividing a cell into two daughter cells is called mitosis. Prophase, metaphase, anaphase, and telophase are its four basic stages. The nuclear membrane deteriorates as the chromosomes thicken during prophase. The center of the cell's chromosomes align during metaphase. One chromosome splits in half during anaphase, sending one half to either side. The telophase is characterized by the pinching together of the cell's centre to form two separate cells.

6 0
1 year ago
Blood is considered a colloid because it contains ____________ in the plasma. Most of these are produced by the ____________ . C
tekilochka [14]

Answer:

Proteins, Liver, Osmotic, Fluid, Into The Blood, Decrease.

Explanation:

Blood is considered a colloid because it contains proteins in the plasma.

Most of these are produced by the liver.

Collectively, these substances exert osmotic pressure and prevent the loss of fluid from the blood as it moves through the capillaries.

The pressure exerted by the plasma proteins is called colloid osmotic pressure.

This force is responsible for moving fluids into the blood and preventing excess fluid loss between blood capillaries and the interstitial fluid.

If plasma protein levels decrease, colloid osmotic pressure will decrease.

I hope this answer helps.

3 0
3 years ago
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HELP!!!!!!
just olya [345]

Answer:

P waves,

Explanation:

There are two types of body waves: P-waves travel fastest and through solids, liquids, and gases; S-waves only travel through solids. Surface waves are the slowest, but they do the most damage in an earthquake (that's a start)

6 0
3 years ago
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