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ella [17]
3 years ago
7

What do scientists think the first organisms on Earth were?

Biology
1 answer:
Setler [38]3 years ago
4 0

Answer:

Ameboas

Explanation:

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The picture below shows the fetuses of different vertebrates at varying intervals of development.
almond37 [142]

Answer:

D. Patterns of human development are similar to those of other vertebrates.

Explanation:

In the attachment above it is observed that the fetal developmental stages appear similar. The pictures represented different fetus of vertebrates such as man, tortoise, Dog, Chick.

During close observation it is noticed that Patterns of human development are similar to those of other vertebrates.

4 0
3 years ago
Read 2 more answers
1. The following statement is similar to those you might see on exams. Write a paragraph of 3-5 sentences describing 1) whether
yanalaym [24]

Answer:

The oxygen dissociation curve represents the percentage saturation of Hb with oxygen at different partial pressure of oxygen. The different partial pressures gives sigmoid shapes to the curve. When this curves shifts to right, it  indicates  low affinity or binding of oxygen by the Hb. it also indicates the unloading or releases of Oxygen by Hb molecules at condition of low pressure. e,g in the muscles during strenuous exercise.However, when the curve shifts to the left, this indicate high affinity for oxygen, great binding, at high partial pressure of oxygen.e,g in the lungs to take oxygen and releases CO2.

Therefore in this scenario, the statement -. <u>During strenuous exercise, the oxygen-hemoglobin dissociation curve shifts to the right.</u> is correct. because oxygen is needed by the muscles therefore ,oxygen should be less binded by Hb,  decrease affinity and easily unloaded to muscles.

<u>The statement </u>This rightward shift reflects an increase in the affinity of hemoglobin for oxygen and favors loading of O2 into hemoglobin in the lungs is wrong.

As explained above the rightwards shift indicated low affinity of Hb for oxygen(unloading)and  favours unloading at the muscles because during strenuous exercise the partial pressure of oxygen is very low(but that of CO2 high) in the muscles which favours low oxygen molecules  binding by Hb, and easy release to respiring cells.

Explanation:

4 0
2 years ago
An organ ________ is a combination of several organs that perform together for a common function. a. basic b. cells c. living d
GenaCL600 [577]

Explanation:

<u>System</u> is a combination of several organs that perform together for a common function.

Hope it will help :)❤

7 0
3 years ago
You are a molecule of phosphorus. Choose a
yKpoI14uk [10]

Answer:

Phosphorus cycles between living things and the soil.

Plants absorb phosphates from the soil and turn them into organic compounds through assimilation.

Animals eat plants and pass the phosphorus through the food chain from one animal to the other.

An animal dies and decomposes, returning the phosphorus to the soil.

Explanation:

6 0
3 years ago
What are the functions of the male reproductive system
Aloiza [94]
  • They produce, maintain and transport sperm (the male reproductive cells) and semen (the protective fluid around sperm).
  • They discharge sperm into the female reproductive tract.
  • They produce and secrete male sex hormones.
6 0
2 years ago
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