Answer:
<h3>
The Prokaryotic Cell</h3>
Prokaryotes are unicellular organisms that lack organelles or other internal membrane-bound structures. Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleoid.
He noticed that each pigeon from each different island in the Galápagos Islands had a different type of beak. Noticing that each bird had a different beak, he connected it to the different environments of each island. He came to the conclusion that the environment of where each bird was determined how their beaks would be shaped. This lead to his theory of natural selection.
they have specialised cells ?
Answer:
Before life began on the planet, Earth's atmosphere was largely made up of nitrogen and carbon dioxide gases. After photosynthesizing organisms multiplied on Earth's surface and in the oceans, much of the carbon dioxide was replaced with oxygen.
Explanation:
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