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max2010maxim [7]
3 years ago
11

1. What is an ecosystem?

Biology
1 answer:
nekit [7.7K]3 years ago
5 0
A biological community of interacting organisms and their physical environment.
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Of the six categories of nutrients, which three produce energy when they're consumed?
larisa [96]
It would be C. Carbohydrates, lipids, and proteins.

Why? Lipids store fat, carbohydrates regulate sugar and energy, and proteins do the functions of the cells.
7 0
3 years ago
Which of the following is not true regarding the denaturation and reannealing of double-stranded DNA molecules? Which of the fol
aleksley [76]

Answer: "Decreasing the salt concentration of the solution lowers DNA's melting point (Tm)" is not a true statement

Explanation:

Increasing salt concentration would lower the DNA's melting point (Tm), not otherwise.

For instance:

- In 8M urea (8M means 8 Moles per dm3), Tm is decreased by nearly 20°C.

- 95% formamide at room temperature would completely denature the double stranded DNA.

Thus, higher concentration of salts like urea or formamide lowers Tm, not otherwise

6 0
4 years ago
What changes occur to chemical bonds during a chemical reaction?
Semenov [28]

Answer:

Interatomic number

Explanation:

Is the chemical bond that holds two atoms together

7 0
3 years ago
The front leg of a cat, the front flipper of a dolphin, and the wing of a bat have the same structure and order of bones. These
Kay [80]

Answer:

The bones are homologous structures

Explanation:

Homologous structures are the structure which are found similar in appearance in different organisms.

The homologous structures in different organism shows that they shared a common ancestor or they diverged from a common ancestor during course of evolution that is these homologous structures are the result of the divergent evolution.

In the given question, the bat, dolphin and the cat shows the same structure of bone which indicates that they have evolved from a common ancestor and is true as they all belong to mammals.

Thus, the bones are homologous structures is correct.

6 0
4 years ago
What is the outermost structure that surrounds and supports plant and fungal cells?
kolezko [41]
They’re cell walls. They provide structure and support for the plant and fungi cells.
7 0
4 years ago
Read 2 more answers
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