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Vladimir79 [104]
3 years ago
13

Which provides evidence for the theory that Earth's life forms evolved from a common ancestor?

Biology
2 answers:
dimulka [17.4K]3 years ago
8 0

Answer:

I'm sorry I don't really have a concrete answer but I think it is B.

PSYCHO15rus [73]3 years ago
3 0

Answer:

B

Explanation:

Because that answer proves that all organisms do come from similar ancestors.

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The practice of cells turning on the production of some enzymes and turning off others in response to a changing environment is
Andru [333]

Answer:

Adaption

Explanation:

In the case when the practice of cells turn on some enzymes production and turn off the others so that the response to the environment i.e. changed is known as an adaption.

In this,  the organisms are adjusted according to the environment

So as per the given statement, the adaption is the answer and the same is to be considered

4 0
2 years ago
A crop is treated with a pesticide and 98% of the insects are killed. what will most likely happen to the remaining insects?
Marina CMI [18]

The 2% of the insects will begin to reproduce and grow their population exponentially and in time enable the population to recover. This is if the population is large enough to enable random mating. The 98% reduction in population drastically reduces competition for the remaining individuals hence giving them abundant resources for them to thrive.   






3 0
2 years ago
Explain the process of cross-pollination.
Anna007 [38]

Cross pollination is the transfer of pollen of different species to stigma of different species of plants.

Cross pollination results in healthy, viable and diverse plants.

Mendel observed that traits could either be dominant or recessive.

Blended traits or incomplete dominance is the condition in which dominant allele could not produce its trait alone instead blending with recessive allele takes place giving new phenotype to progeny.

Explanation:

In cross pollination pollen transfer takes place from anthers to stigma. In Mendelian genetics the anthers of the plant was removed because it has both male and female parts on same plant so that self pollination does not take place.

The importance of cross pollination is that it creates diversity in the plant species since the traits having different alleles are combined to form the progeny plant. The offspring are healthier and high quality seeds are found.

Mendel observed that traits are either dominant or recessive in general.  It was observed that when homozygous parents were crossed, the progeny in F1 generation always had dominant trait. The recessive trait only appeared when F1 generation offspring were self pollinate.

Blended traits or incomplete dominance appear when alleles get blended and exhibit the traits in phenotype. The phenotype appeared will not be matching with either parents.

The example is a white coloured flower is crossed with red colour flower the resultant colour of the flower is pink. It shows that dominant allele red is not completely dominant and gets blended with white colour.

7 0
3 years ago
List some examples of pollutants created by the burning of fossil fuels. What are some of the effects of these pollutants?
balandron [24]
All the emissions go in to the atmosphere and that causes the ozone layer to open up more and let radiation in.  the effects are that they pollute the wild life around it and the people that have to dig it up destroy the natural habitat 
5 0
3 years ago
Which best describes the nucleus of an atom?
Naily [24]

Answer:

A. It is the most massive part of the atom.

5 0
2 years ago
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