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Viefleur [7K]
3 years ago
5

1) Which is the variation stage and why?

Biology
2 answers:
spin [16.1K]3 years ago
6 0
Think you forgot to add a picture but a variation stage is a method for dealing with rapidly varying environments without requiring mutation
Romashka-Z-Leto [24]3 years ago
5 0
Did you forgot to add a picture?
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Explain how the genetic disease called Sickle Cell Anemia is more prevalent in African- Americans compared to other races becaus
Brrunno [24]

Answer:

Explanation:

This is because sickle cell disease is common in malaria dorminated area because their traits confers resistance to malaria. The red blood cells, which contain abnormal hemoglobin become sickle in shape after it has been affected by malaria parasite. Therefore, most American that have African ancestry are at high risk of

the disease because the African ancestry are carriers if this gene and are inherited by the Americans.

7 0
2 years ago
Swimmers itch is an initial symptom of which of the following?A. tularemiaB. schistosomiasisC. Chagas diseaseD. Lyme diseaseE. m
bogdanovich [222]

Answer: B. schistosomiasis

Explanation:

Swimmer's itch is also called as cercarial dermatitis. It appears as a skin rash. It is typically an allergic reaction which is caused by a parasite.

Swimmer's itch is the symptom of Schistosomiasis. It is a disease which is also called as snail fever. It is caused by the parasitic flatworm called as schistosomes. This parasite infects the urinary tract and intestine in humans. Other symptoms include the diarrhea, abdominal pain, bloody stool and blood in the urine.

6 0
3 years ago
Which steps are important when designing and conducting a scientific experiment
Burka [1]
Forming an hypothesis, gathering materials, performing your experiment, and determining the conclusion. Also determining independent and dependent variables could be one depending on the teacher. Sorry if I’m wrong!
4 0
2 years ago
Read 2 more answers
Multiple choice question
Evgesh-ka [11]

Answer:

a chain of amino acids makes a protein

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2 years ago
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On a backpacking trip, Kenny hikes all day at a steady pace, covering 30 kilometers and burning 4000 Calories. At the school tra
olganol [36]

Answer:

A. If the aerobic pathway—cellular respiration—cannot meet the energy demand, then the anaerobic pathway—lactic acid fermentation—starts up, resulting in lactic acid buildup and "oxygen debt."

C. After about 90 seconds of intense exercise, the muscles become depleted of oxygen, and anaerobic respiration can no longer function to produce ATP, resulting in "oxygen debt."

Explanation:

There are two sources of carbohydrates in the human's body for energy (ATP) production. 1) Creatine phosphate and 2) Glycogen. Creatine phosphate metabolizes easily and yields ATP quickly. Whereas glycogen is stored form of carbohydrate which yields energy more slowly. Therefore, initially, our bodies use creatine phosphate and then shift to glycogen. Within 60-90 seconds, the creatinine phosphate in the body is mostly utilized and then energy is produced by the use of glycogen in aerobic pathway. During areobic pathway, oxygen supply is sufficient and per cycle, it produces 32 molecules of ATP. However, when oxygen supply is limited or absent, the body will metabolize glycogen to lactic acid via fermentation and produce only 2 molecules of ATP.

Now consider the example: Kenny hikes all day at a steady pace therefore the supply of oxygen is sufficient for aerobic cellular respiration for ATP production. In this scenario, the oxygen debt is minimal and Kenny relies on aerobic respiration pathway to obtain energy. On the other hand, Janelle runs fast (100 meters in 13.5 seconds) and her cellular respiration would be on the compense of aerobic pathway initially which will be shifted to anaerobic pathway after the supply of oxygen is reduced/minimum. Janelle will heavily rely on the anaerobic pathway because running fast needs energy which cannot be provided via aerobic pathway easily. Therefore, Janelle's body will produce lactic acid and suffer from oxygen debt.

7 0
3 years ago
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