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natita [175]
3 years ago
9

For thousands of years, scientists didn’t know cells existed. What major invention helped open their eyes to the world of cells?

Chemistry
1 answer:
Snezhnost [94]3 years ago
5 0

Answer: microscope?

Explanation:

I'm not exactly sure it could even be an invension of some kind of test or experiment

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I need help with my quiz.
katrin2010 [14]

Answer:

C

Explanation:

4 0
3 years ago
Read 2 more answers
3 Na2O(aq) + 2 Al(NO3)3(aq) ----> _ Compound A + _ Compound B
Olin [163]
3Na2O(at) + 2Al(NO3)3(aq) —> 6NaNO3(aq) + Al2O3(s)

This is a double replacement reaction and NaNO3 is aqueous because Na is an alkali metal, plus nitrate is in the solution. Both of these are soluble. Al2O3 is not soluble because it does not contain any element that is soluble and is hence the precipitate.

Hope this helped!
7 0
2 years ago
What is the role of shrimp with respect to salmon in him food chain
KiRa [710]

The answer is  *B. Prey*

8 0
3 years ago
Read 2 more answers
A reaction progress curve has three peaks and two valleys between the peaks. This curve describes a reaction mechanism that invo
katrin [286]
Answer:
            <span>A reaction progress curve has three peaks and two valleys between the peaks. This curve describes a reaction mechanism that involves <u>three elementary reactions</u>.

Explanation:
                   I have drawn the progress curve with three peaks and two valleys. In fact the peaks shows higher energy and valleys show lower energies. So, Let suppose we react A and B. This reaction between A and B results in the formation of C. In this reaction the energies of A and B are less, and during the progress of reaction they cross a transition state of higher energy and forms product C with lower energy which is present at lower valley. This was first reaction. Other two reactions will be followed by conversion of C to D and conversion of D into E.</span>

3 0
2 years ago
Read 2 more answers
More efficient plumbing reduces water pollution by _______. a. using more water b. using less water c. using cleaner water d. us
Aliun [14]

Answer:

b. using less water

Explanation:

Pollution can be defined as the physical degradation or contamination of the environment through an emission of harmful, poisonous and toxic chemical substances.

In the United States of America, the agency which was established by US Congress and saddled with the responsibility of overseeing all aspects of pollution, environmental clean up, pesticide use, contamination, and hazardous waste spills is the Environmental Protection Agency (EPA). Also, EPA research solutions, policy development, and enforcement of regulations through the resource Conservation and Recovery Act.

In homes and offices, an effective and efficient design of pipes and other water-related facilities would go a long way to reduce water pollution because the water used are well managed and properly disposed into sinkholes.

Hence, more efficient plumbing reduces water pollution by using less water

6 0
2 years ago
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