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miss Akunina [59]
2 years ago
13

The carrying capacity of an ecosystem is the maximum number of individuals of a certain species the ecosystem can support. Carry

ing capacity is determined by
A. environmental resistance only
B. both biotic potential and environmental resistance
C. neither biotic potential nor environmental resistance​
Biology
1 answer:
brilliants [131]2 years ago
3 0
Hope this helps, although not 100% positive

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What are the four important conditions of a respiratory surface
Ksivusya [100]

The four important characteristics of respiratory surface are:

1. Thin walls

2. Moisture

3. Large surface area

4. Blood supply

Respiratory system or respiratory tract is divided into upper and lower tract. Upper respiratory tract includes nose and its cavities, sinuses, pharynx and the part of the larynx. Lower respiratory tract consists of the trachea, bronchi, bronchioles and the alveoli.

Alveoli are the ends of the respiratory tract the smallest units in it. Alveoli are small folded air sacs that are branching off from alveolar ducts and providing an extremely large surface area for the gas exchange. Gas exchange occurs thanks to small blood vessels – capillaries that surround alveoli and it occurs via the process of diffusion.

So, respiratory surface is thin membrane also known as the blood–air barrier that consists of the alveolar epithelial cells, their basement membranes and the endothelial cells of the alveolar capillaries.

6 0
3 years ago
Cell at metaphase of mitosis contains 20 sister chromatids, how many chromosomes will be present in a g1 cell? if a cell at meta
kumpel [21]

Answer:

The correct answer would be 10.

The cell cycle can be divided into four phases namely gap 1 (G₁) phase , synthesis (S) phase, gap 2 (G₂) phase, and  mitosis (M) phase.

DNA (deoxyribonuceic acid) content is only replicated and doubled in the S phase. However, the chromosome number remains the same. It can be explained as the number of chromosomes remains the same (2n) but number of chromatids doubles (4n) after S phase.

The number of chromatids restores to 2n in daughter cells after completion of mitosis.

Hence, if number of chromatids in metaphase was 20 i.e. 4n then the number of chromosomes (2n) would be 10.

Hence, 10 chromosomes or 5 pairs of chromosome would be present in the cell during its G₁ phase.

4 0
3 years ago
Science biology hw please help fast
Anuta_ua [19.1K]

Answer:

A. is palisade mesophyll

B. is spongy mesophyll

EXPLANATION OF PALISADE MESOPHYLL

  • Palisade cells are found in the mesophyll of a leaf and their main function is the absorption of light so that photosynthesis can take place.
  • The palisade mesophyll consists of chloroplasts with chlorophyll that absorb the light energy
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8 0
3 years ago
Chains of glucose make up?
vfiekz [6]

Answer:

They make up carbohydrates.

6 0
3 years ago
Please help............................
Dominik [7]
D- both involve moving substances across a membrane
Reasoning:
-Active transport moves against the concentration gradient ( low to high)
-Passive transport moves higher to lower concentration
8 0
3 years ago
Read 2 more answers
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