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Zina [86]
2 years ago
8

Does anybody know the answer?? It’s for a important test

Biology
1 answer:
BigorU [14]2 years ago
3 0

Answer:

280

Explanation:

Each line is 20 so count till the A line and you get 280

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Which of the following fossil types is best described as forming when minerals replace all or part of an organism's body?
kumpel [21]

Answer:

A cast

Explanation:

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3 years ago
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Which of the following is an example of point-source pollution?
kodGreya [7K]

Answer: D. Acid from abandoned mines

Explanation:

Point source pollution can be define as the pollution that can be caused by a pollutant whose source of origin is known. As the source of origin is known the path of the pollutant can be traced back to it's origin hence, the pollution can be controlled.

Among the options given, D. Acid from abandoned mines. is the correct option this is because of the fact that the source of origin of the pollutant is known that is abandoned mines.

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3 years ago
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Earth's sysems can interact quickly or over long periods of time. Give two examples of how Earth can change quickly and two exam
VARVARA [1.3K]
Quickly... this is a harder one, because all of possible answers are the result of interactions over a long time. However, these change the surface of the earth the fastest
1.) Volcanoes
2.) Flooding

Over a long time
1.) Through the rock cycle... earthquakes, mountain forming, etc.
2.) Melting, or forming of ice... changes sea levels
3 0
3 years ago
Give two ways to preserve and conserve endemic species.​
Jobisdone [24]

Educate your family about endangered species in your area.

Recycle and buy sustainable products.

Recycle and buy sustainable products.

Reduce your water consumption.

Volunteer. If you don't have money to give, donate your time

6 0
3 years ago
Compare and contrast light microscopes, scanning electron microscopes, and transmission electron microscopes. Sort each statemen
podryga [215]

Answer:

<u>Light microscope</u>:

  • use a beam of light to produce magnified images
  • can be used to examine living cells and tissues

<u>Scanning electron microscope</u>:

  • use a beam of electrons to produce magnified images
  • can be used to examine DNA
  • can be used to examine cells

<u>Transmission electron microscope</u>:

  • use a beam of electrons to produce magnified images
  • can be used to examine DNA
  • can be used to examine cells

Explanation:

Light microscope: is a commonly used microscope also known as compound microscope. Magnifies images from 40X upto 1000X. It uses ray of visible light to produce a magnified image. The light microscope can be used to view specimen of both living and dead cells or tissues. However, it doesn't give a detailed view of a specimen like electron microscope.

Scanning electron microscope: It uses electron beam as an illuminating source. It has a much higher resolving power than light microscope because it uses electrons instead of light. It magnifies object upto 500000 times the actual size. Internal structures can also be viewed. However, only dead specimen can be used because the beam of electrons can kill the cells. They are of two types:

  1. <u>Scanning electron microscope(SEM): </u>an electron beam passes over the specimen's surface and displaces electrons which are then focused on  a screen to form an image. Images appear in 3-D
  2. <u>Transmission electron microscope: </u>electromagnets magnify the image by passing beam of electrons through a thin specimen. Images appear in 2-D

7 0
3 years ago
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