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Verdich [7]
2 years ago
13

What do Scientists use tools for

Biology
1 answer:
barxatty [35]2 years ago
3 0
They use tools to help take precise measurements, carry out experiments, and make observations.
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In humans, it has been estimated that approximately _____ percent of fertilized eggs fail to develop into viable organisms.
Wewaii [24]
Upto 50%of human conceptions fail before the little guys can swim successfulllyinto the egg and be home free :)
6 0
3 years ago
Each cell that enters the cell cycle contains sister chromatids<br><br> a. True<br> b. False
Snowcat [4.5K]

Answer:

b. false

Explanation:

The cell cycle consists of three states: Interphase, Cell division (mitosis) and Resting.

Interphase is composed of phases G1, S and G2. during this state the cell replicates the genetic material of its chromosomes to prepare itself for cell division

In G1 the cell synthesizes mRNA and proteins that the cell will need during mitosis.

In S the cell replicates the genetic material of its chromosomes to prepare itself for cell division. At the end of this phase each chromosome is composed of two sister chromatides.

In G2 the cell grows and and more proteins synthesized  for mitosis.

Mitosis is the production of two daughter cells from a sinlge one. During the entire mitosis the chromosomes are duplicated in the cell until finally, the genetic material is distributed in two cells after cytokinesis.

According to the above, it can be seen that  the chromosomes in a cell that is in the cell cycle do not necessarily have sister chromatids. For example, chromosomes during G1 do not have sister chromatids.

3 0
3 years ago
How do changes in the atmosphere from burning fossil fuels affect plant life? Select two correct answers
german

Answer:

I'd Say A because it talks about slowing down the plants and removing stuff from the soil. Fire and smoke only cause problems for the surrounding area by blocking the sun and burning the ground, removing materials plants need for life. Then when it rains all the acidic stuff kills the ground as well.

Explanation:

Hope this helped.

A brainliest is always appreciated.

7 0
2 years ago
Which fiber is made up of protein<br>​
Murljashka [212]

Answer:

Natural protein fibers.

Explanation:

Fibers such as wool, hair,and silk, are made of protein. These are all natural fibers.

<em>Hope this is correct. Wishing you the best.</em>

3 0
3 years ago
Read 2 more answers
If you cut a tree trunk into pieces, the resulting pieces and dust add up to the same mass as the original trunk. This is a demo
Alik [6]

Answer:

The law of conservation of mass

Explanation:

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

3 0
3 years ago
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