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son4ous [18]
2 years ago
12

Explain three ways that humans threaten biodiversity

Biology
2 answers:
____ [38]2 years ago
8 0
1. humans cause deforestation, which destroys animals' habitat
2. humans cause water pollution, by throwing harmful chemicals in the sewer causing marine animals to die 
3. humans are destroying animals' habitat forcefully to build more homes for peoples 
Rus_ich [418]2 years ago
6 0

The three ways in which the humans threaten the biodiversity are:

Pollution: Human beings tend to pollute the biodiversity in many ways, by polluting the soil, land and water.  The oil spills, chemicals and pesticides from agricultural run off pollutes the water and land.

Deforestation: The cutting down of trees in huge amount can led to deforestation of trees. The use of timbers and log for commercial purposes increased the problem of deforestation.

Over exploitation: The use of fossil fuel and other resources more than the need which means to fulfill the greed of human being has led to over exploitation.

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Answer is :

Platinum .  

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Otters spend most of their time in the water. Over time otters have developed a coat with soft underfur to trap warm air near th
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Cold weather triggers the underfur to grow each winter.

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5 0
2 years ago
A newly discovered species of dung beetle has 2n = 16 chromosomes. It mates with a closely related beetle species that has 2n =
Kamila [148]

Answer:

Option 3, 20 or 22

Explanation:

A newly discovered species of dung beetle has 2n = 16 chromosomes. It mates with a closely related beetle species that has 2n = 12 chromosomes. How many chromosomes would there be in an allotriploid beetle produced from this cross?  

  1. 40 or 44
  2. 20 or 22
  3. 20 or 22
  4. 36 or 48
  5. 40 or 44

Solution

An allotriploid is a species which contains  three sets of chromosomes of different species .Crossing can result in triploid offspring with diploid gamete of one species and regular haploid gamete of other offspring  

Case I - Resulting offspring (3n) = Gamete I (2n) + Gamete II (n)  

OR

Case II - Resulting offspring (3n) = Gamete II (2n) + Gamete I (n)  

Case I  

2* 8 + 6 \\= 16 + 6 \\= 22

Case II

2* 6 + 8\\= 12 + 8\\= 20

Hence, option 3 is correct

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3 years ago
What best states the purpose of villi?
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Describe the role of the Circulatory/Cardiovascular system in helping the body rid of carbon dioxide
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The circulatory system comprises of blood vessels which help in removing carbon dioxide from the body. The carbon dioxide produced by the cells is collected by the capillaries  where the carbon dioxide gets dissolved in the blood. This blood is carried to the heart via the veins. The heart pumps the deoxygenated blood to the lungs where gaseous exchange occurs between the blood capillaries and the alveoli of the lungs. When we exhale, the carbon dioxide is breathed out.

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