Answer:
Enzymes speed up the chemical reactions in living cells.
Explanation:
An enzyme is a biological catalyst and is almost always a protein. It speeds up the rate of a specific chemical reaction in the cell. The enzyme is not destroyed during the reaction and is used over and over.
No, chloroplast is only found in plant cells, it adds pigment which is why plants look green.
Internal fertilization is when male deposits sperms directly in females body whereas internal fertilization is when male and female gametes unite outside the female body .
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<u>Answer:</u>
Scientist think colonies of Cyanobacteria called stromatolites were responsible for the introduction of oxygen into earths atmosphere is true.
<u>Explanation:</u>
- In primeval earth’s atmosphere, stromatolites (colonies of Cyanobacteria) are believed to have increased the level of oxygen by their photosynthesis process.
- These are the first known organisms that started photosynthesis process and produced the oxygen to the earth’s atmosphere.
- There is a theory that, these organisms produced oxygen in the environment and the organism disappeared that couldn’t live in the atmosphere with the oxygen.
- Scientists gave this a name called as “great oxygenation event”.
The answer is d. allowing the good genes to slowly <span>spread through the population.
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<span>Natural selection is the differences in survival
and reproduction as the consequence of differences in genotypes and, consequently, phenotypes. It is one of the factors of evolution that affects a frequency of different variations. </span><span>In natural selection, genotype variations that
will increase the chance of survival and reproduction of some organism are
preserved and will be inherited Thus, "good genes" will be inherited. But, as the evolution, it will be slow process, since rarely evolution happens quickly.</span>
