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Anarel [89]
3 years ago
8

Questions:

Biology
1 answer:
Neporo4naja [7]3 years ago
7 0

Explanation:

1. cell membranes are partialy permeable, only allowing passage to some certain molecules.

2. diffusion is the movement of molecules across partially permeable membrane down concentration gradient.

3. the molecules are too big to pass through partially permeable membrane. the concentration of the molecule might be higher in the cell than in the solution/surroundings.

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What color does a test solution turn when protein is present
vodomira [7]

Answer: pink-purple

Explanation: Biuret solution is used to identify the presence of protein. Biuret reagent is a blue solution that, when it reacts with protein, will change color to pink-purple.

8 0
2 years ago
Why is the movement of basic elements in<br> ecosystems different from the transfer of<br> energy?
Dmitrij [34]

Answer:

Chemical nutrients and energy tend to flow in the same direction for most of an ecosystem. The big difference is that the chemical nutrients are ultimately recycled in the ecosystem while the energy is ultimately lost from the ecosystem to the universe at large. Energy in any ecosystem ultimately comes from the Sun

Explanation:

7 0
3 years ago
Complete the sentence.
taurus [48]
D because if the species was to be removed from an ecosystem, everything that needed that species as food, or the species ould have to adapt to the foods available in the new ecosystem they live in. Hope I helped, and let me know if you are still not 100% sure about the answer, and I'll try to clarify what I said.
8 0
3 years ago
A burdock is a weed. The seed heads of the weed are burrs with hooked tips. These tips catch on cows, deer, or even people as th
Aleks04 [339]

Answer:

COMMENSALISM

Explanation:

The interaction of organisms with one another in an ecosystem is called SYMBIOSIS, if it involves two organisms of same or different species. One type of symbiotic relationship is COMMENSALISM, which is a relationship in which one organism benefits while the other neither benefits or gets harmed.

This is the case of the burdock weed and its association with cows, deers or people. The burdock weed benefits from the relationship by getting Its seeds that attaches to the cow's, deer's or human's skin via its hooked-tip burrs, transported to varying locations. Thus, helping to spread the plant. The cow, deer, or human does not benefit fron this relationship neither is it harmed.

5 0
2 years ago
Compare and contrast net energy, the net-energy ratio, and energy<br> efficiency
Lelu [443]
Net energy is the amount of that is actually useable from an energy resource. Net-energy ratio is the ratio of the amount of useable energy from a resource and the amount it takes to make that energy useful. ... An energy source with high energy efficiency provides a lot of work for the amount of energy used.
4 0
2 years ago
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