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LekaFEV [45]
4 years ago
8

The sickle cell allele is an example of which evolutionary force? how many base changes result in hemoglobin s? in which environ

ment does possessing a sickle cell allele provide an advantage? what is the favored genotype?
Biology
1 answer:
Tamiku [17]4 years ago
7 0
The allele for sickle cell anemia would be an example of natural selection. In most situations, having crescent shaped red blood cells would hold less oxygen & would not be ideal. But in places that are affected by diseases like malaria, which attack red blood cells, having crescent blood cells minimizes the threat malaria can cause.

Hope this helps!
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Which below are specialized for life in a hypotonic environment?
OLga [1]

Plant cells are specialized for life in a hypotonic environment.

Answer: Option A

<u>Explanation:</u>

A cell which lacks the cell wall, will expand and burst. At the point when set in a hypertonic solution, a cell without a cell wall will lose water to the surrounding, wilt and presumably die.

In a hypertonic arrangement, a cell with a cell divider will lose water as well. The plasma layer pulls from the cell wall as it withers, a procedure called plasmolysis. Thus it can be inferred that plant cell are specialized for life in a hypotonic environment.

8 0
4 years ago
How can a nutrient be a limiting factor in an ecosystem?
r-ruslan [8.4K]
If a nutrient is short in supply, it will limit the organisms growth.
7 0
3 years ago
Many scientists are worried that the increased amount of carbon dioxide in Earth's atmosphere will _____
loris [4]
The answer will be C. Cause Earth to warm up unnaturally


Explanation: the more carbon dioxide in the atmosphere, the hotter the earth will become. Changing the earths climate
8 0
3 years ago
•What seven characteristics are unique only to marine mammals—not all mammals?
Anuta_ua [19.1K]
PART 1

1. They nurse their young with milk produced by mammary glands.
2. <span>There are international laws and treaties that protect marine mammals.
3. </span><span>Unfortunately, many marine mammals are considered endangered species and there are still threats to most of their populations, such as illegal hunting, pollution, climate change, and habitat loss. 
4. T</span><span>hey have adapted to living all or part of their life in the ocean.
5. </span><span>To keep warm in the ocean, most of them depend on a thick layer of blubber (or fat). 
6. </span><span>To be able to stay under water for long periods, they store extra oxygen in their muscles and blood.
7. </span><span>They also have more blood than land mammals in proportion to their body sizes, can direct their blood flow to only their vital organs (such as their heart and lungs), and can slow their heartbeat down so they are using less oxygen in a dive.

PART 2
</span>Kingdom: Animalia
<span>Phylum: </span>Chordata
<span>Class: </span>Mammalia
<span>Order: </span>Cetacea                                                                                                                                                                                              <span>The Order Cetacea is the group of marine mammals that includes the </span>cetaceans<span> - the whales, dolphins and</span>porpoises.<span>There are </span>86 species<span> of cetaceans, and these are divided into two suborders - the mysticetes (</span>baleen whales, 14 species) and odontocetes (toothed whales<span>, 72 species).</span>

Hope this helped...Good luck!

3 0
3 years ago
A client with rheumatoid arthritis is scheduled to participate in an exercise program that is established at the extended care f
Helga [31]

Answer:

d) "After I eat breakfast, I do one set of exercises slowly, and then I space the rest of them throughout the day."

Explanation:

Spacing activity protects joints from overuse, misuse, and stress, limiting inflammation; it provides a balance between rest and activity. The exercise program should be planned; too much activity can precipitate an exacerbation, and too little may cause contractures. Spaced range-of-motion exercises should be incorporated into daily living activities, not just twice a day. The actions expressed in the response "Because I'm stiff in the morning, I do most of my exercises then, so I'm done for the day" will cause stress at the joints, which may precipitate an exacerbation

7 0
3 years ago
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