BIOLOGY MIDDLE SCHOOL

How do the populations in a community depend on each other

Answers

Answer 1
Answer: Populations (all members of one type of organism living in an ecosystem) in a community (several populations living in an ecosystem) depend on each other because different species in various  population could be sharing a similar food chain and depending on each other for survival.

if one population dies out in a community then all the populations that depend on that species for food may also die out. Hence a change in one population affects the entire community because all the populations in a community depends on each other. 
Answer 2
Answer: If you are talking about a community of like animals then they depend on each other because some animals could be in the same food chain to survive for food , if 1 species died out then most would be impacted by it and maybe die out too. Hope it makes sense and helps...!

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Poor people in the worlds largest cities live in just a few dollars a day but typically have access to clean water and sewers

Answers

If the question is true/false- the answer would be false

Poor people usually do not have access to clean water and sewers.

Poor people usually do not have access to clean water and sewers.

Explain how an immune response starts after a macrophage attacks a pathogen.

Answers

After the macrophage fails the Helper T Cell stimulates the B cells (create antibodies) if pathogen is extracellular and Cytotoxic T Cells (killer T cells, release perforin) if pathogen is intracellular. Once the pathogen is killed the B Cells create Memory B Cells and the Killer T Cells create memory T Cells. 
Hope that's helpful.

Explain why some scientific theories are changed over time​

Answers

Answer:

A common misconception is that scientific theories are rudimentary ideas that will eventually graduate into scientific laws when enough data and evidence have been accumulated. A theory does not change into a scientific law with the accumulation of new or better evidence.

Explanation:

The alleles BB for black hair and LL for long hair are part of that cat’s

Answers

Is it the Genes? ???????

While viewing a water sample under a microscope, you observe a single cell. Which of the following observations could you use todetermine if the cell is prokaryotic or eukaryotic?
A.
The cell contains genetic material.
B. The cell contains cytoplasm.
C. A flagellum is present.
D.
The contents are surrounded by a cell wall.
E.
The cell's DNA is encapsulated in a nucleus.
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Answers

Answer:

E.  The cell's DNA is encapsulated in a nucleus.

Explanation:

There are no membrane bound organelles present in a prokaryotic cell. Nucleus is a membrane bound organelle so it is absent in a Prokaryotic cell so it is an evidence that cell is Eukaryotic cell.

While other features mentioned in the question are common both in prokaryotic and eukaryotic cell.

What information does a linkage map provide

Answers

A map of the genes on a chromosome based on linkage analysis.

hope that I helped :)

Answer:A

Explanation:

that and the js7
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