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9966 [12]
3 years ago
10

How can a physical change to an environment affect the number of organisms in an ecosystem?

Biology
1 answer:
maria [59]3 years ago
5 0

It can cause a chain reaction. Every cause has an effect.

Example: Someone throws a cigarette out their window, causing a grass fire

Scenario A: A prairie dog population was killed in the grassfire simply because they had no time to escape.

Scenario B: The grasshoppers don't have grass to eat, so the prairie dogs don't have meat to survive because the grasshoppers are starving. Either way, the person who threw the cigarette caused a decrease in the population.

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4
Anarel [89]

Answer:

Ос.  He used DNA testing to compare evidence to possible criminals.

Explanation:

Detective Scott worked to solve cases by the use of DNA testing which is an efficient way to solve a criminal case because DNA testing provides all information about the criminal. Due to this DNA testing, he solved many cases  and the criminal caught with the help of this testing. If he can't use this DNA testing method then the case would not be solved.

6 0
3 years ago
The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-Saharan Africa than among those o
Ivanshal [37]

Ans.

Sickle-cell disorder is a genetic disorder, which shows defected red blood cells, due to mutation in the genes for hemoglobin protein.

Malaria is common in sub-Saharan Africa region and there, natural selection favored gene for sickle cells, because it might be beneficial to people having sickle cell disease that makes them able to survive in such condition and transmit their genes to offspring.

On the other hand, in those Africans, who moved to United States, where malaria is uncommon or absent, natural selection favored normal, wild type genes, resulting in fewer people with defected sickle cell.

Hence,  sub-Saharan African population shows higher percentage of mutated gene for sickle cell as compared to population of United States.

Thus, the evolutionary process behind this difference is 'natural selection.'

4 0
4 years ago
Two types of Nucleic Acids are ??
Jobisdone [24]

Answer:

the answer is D) DNA and RNA

5 0
3 years ago
The tundra is cold year-round. it has short cool summers and long, severe winters. The tundra has a permanently frozen sublayer
harkovskaia [24]
I’m pretty sure it is B. Please double check answers tho. It’s been a while since I learned adaptations. Also, if u go to my profile, it says I am 43. I am not a 43 year old middle schooler lol
4 0
4 years ago
A scientist helps a colleague do a better experiment by?
MissTica
Watching adding notes, correcting, and overall being a part of the project he/she is working on.
7 0
3 years ago
Read 2 more answers
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