<u>Answer:</u>
Fossils are the sources to learn the changes on the earth and how much it changed in these years. Its provides us with information about the existence of plant and animals in the past.
Actually, the fossils we found till the date are the ancestors of the plants and animals that live today. Moreover, some fossils of animals are easily identifiable since they exist till the date.
But there are fossils of animals that exist no longer in the earth. By studying and analyzing the fossils, one can tell how life on the earth has changed.
Also, we can learn about the ancestors of the plants and animals and how their long life existed on earth.
In other words, one can learn where and how those organisms were lived. So that we can know about our ancient environments.
Answer:
Because of how genes change and how quickly they change, evolution is complicated. At the start of evolution, there shouldn't be a straight tree branch—it should be a twisted mess.

Nucleus, mitochondria, vacuole, cytoplasm,
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<h2>
Answer:</h2>
<u>Inversely proportional.
</u>
<h2>
Explanation:</h2>
The distance between two wave troughs is considered as wavelength whereas the number of wave crests passing over the origin every second is termed as frequency. The former is denoted by symbol known as lambda whereas the latter is denoted by '
'.
We can utilize this relationship to compute the wavelength or recurrence of any electromagnetic wave on the off chance that we have the other estimation. Simply separate the speed of light by whichever estimation you have and afterward you have the other.
Frequency = Speed of Light/Wavelength
f = c/λ
Wavelength = Speed of Light/Frequency
λ = c/f
Above given equation demonstrates that wavelength and frequency are inversely proportional to each other which means that higher the frequency, shorter will be the wavelength and vice versa.