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kirza4 [7]
3 years ago
9

Which of the following is true regarding extinction?

Biology
1 answer:
mars1129 [50]3 years ago
6 0
C. Single events or several causes working together to produce extinction in a short period is referred to as mass extinction.

<span>Example:
</span><span>Destruction of forests, mountains, and bodies of water to satisfy human needs result to the imbalance of nature which also give rise to global warming.

</span><span>Animals and plants have lost their habitats. They lost their means to live. They lost their food sources and they suffer and die because of humans irresponsible acts.</span>
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Fertilizers have nutrients that help plants grow. Sometimes, when it rains, fertilizers are washed away from farmland into ponds
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B) They do not get enough oxygen, and die.

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They loose oxygen due to the algae. The algae bloom uses up all the O2 in the plant structures .

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Which of the following correctly describes the path sound travels through the ear?
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a is correct

Pinna (earlobe) - external auditory canal - tympanic membrane - ossicles - cochlea - organ of corti - brain

Explanation:

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2 years ago
The respiratory membrane, through which a molecule of carbon dioxide must travel in order to diffuse from the blood into the alv
8_murik_8 [283]

Answer:

A. True

Explanation:

There are two sites where exchange of gases takes place, one is the exchange of gases between alveoli and blood and the second is exchange of gases between blood and tissue. In this question we are discussing about the about the diffusion of CO2 from blood to the alveoli for exhalation. CO2 must cross the diffusion membrane.

Diffusion membrane:  The alveolar wall is thin and has rich network of capillaries. Due to this network, alveolar wall looks like a sheet of flowing blood and is called the diffusion membrane or alveolar-capillary membrane.This diffusion membrane is made up of three layers:

a. The thin squamous epithelium of alveoli

b. Endothelial lining of blood capillaries

c. a fused basement membrane between epithelium of alveoli and endothelium of capillaries.

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3 years ago
In the near future a Space X mission to Mars discovered a species that was previously unknown. Elon Musk decided to name the spe
iren2701 [21]

Answer:

  • 25 tall individuals, TT
  • 50 medium individuals, Tt
  • 25 short individuals, tt

Explanation:

<u>Available data</u>:

  • The size of this species was determined by a single gene
  • TT- Tall
  • Tt- Medium
  • tt- Short
  • Total number of individuals in the progeny, N = 100

There are three phenotypes and only one gene, so it seems that this is an example of incomplete dominance, where the medium-size is the intermediate form between tall-size and short-size.  

Cross: between two medium Gazorps

Parentals) Tt    x    Tt

Gametes) T  t       T   t

Punnett square)    T           t

                    T       TT         Tt

                    t        tT          tt

F1) 1/4 = 25% TT, tall

    2/4 = 1/2 = 50% Tt, medium

    1/4 = 25% tt, short

100% of the progeny ------------ 100 individuals

25% Tall, TT ------------------------X = 25 individuals

50% Medium, Tt -------------------X = 50 individuals

25% Short, tt ------------------------X = 25 individuals

5 0
3 years ago
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