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Leni [432]
3 years ago
7

What type of lenses were used for the first microscopes?

Biology
1 answer:
sergeinik [125]3 years ago
6 0

Answer:

Here is some background information...

Explanation:

Leeuwenhoek (1633-1723) used melted glass balls to form lenses for apparently crude simple microscopes that nevertheless magnified up to 275 times! Modern tests have concluded that he could have achieved a resolution of two micrometres.

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Implanting an electrode that supplies a weak electrical current to specific brain areas is called _____. It is useful in the tre
hodyreva [135]

Answer:

Deep Brain Stimulation (DBS)

Depression, Uncoordinated body movements such as in Parkinson's disease

Explanation:

Deep brain stimulation is a surgical procedure in which a device that sends electrical impulses to the brain by means of lead wires connected to electrodes placed in the specific areas of the brain, is implanted in the body, typically the chest region.

This surgical procedure is usually required to treat diseases in which there is irregular and improper nervous stimulation of the brain resulting in various nervous disorders such as irregular muscle movements as in Parkinson's disease as well as depression.

The impulses sent from the stimulator device to the electrodes in the brain through the wires, serves to stabilize and normalize nerve signals sent to the brain.

7 0
4 years ago
URGENTT!
zhuklara [117]

Answer:

Yes, a fire takes food for energy.

No, a fire doesn't reproduce.

Yes, a fire produces waste.

Explanation:

For fire, the food that it requires is the objects that help in the process of burning. The objects can be wood, paper, coal, fuel, etc. Oxygen is required for the process of burning to take place.

The process of reproduction undergoes in living beings. Fire produces heat and light but this cannot be termed to be a process of reproduction.

Burning produces wastes in the form of ash and burned products. Therefore, it can be said that fire produces wastes.

4 0
3 years ago
What cell structure helps the cell stay flexible and maintain homeostasis?
MaRussiya [10]

Answer:

The cell membrane.

Explanation

I hope this helps you.

3 0
3 years ago
HELPPP
Taya2010 [7]

Answer:

(A)

Explanation:

High pressure has nothing to do with expiration(breathing out).

<em>Hope</em><em> </em><em>it</em><em> </em><em>helps</em><em> </em><em>:</em><em>)</em>

5 0
3 years ago
Some species of sharks are on the verge of extinction because of shark finning. Washington, California, Guam, and Hawai'i prohib
Snowcat [4.5K]

Answer:

1.yes

2.yes

3. if we don't interact with sharks they might not interact with us as often

Explanation:

3 0
3 years ago
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