Atoms come together to form molecules because of their electrons. Electrons can join (or bond) atoms together in two main ways. When two atoms share electrons between them, they are locked together (bonded) by that sharing. These are called covalent bonds
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Answer:
Paleontologists didn't have the technology in that time to get a good estimation on the events. Back then, they had to rely on natural sources "markers" that made the estimations. Those estimations weren't accurate. Today's measures are accurate.
Answer:
If a woman has only daughters then the father must have passed the X chromosome that fertilised the egg each time
Answer:
5. C- Adenine
6. -
Explanation:
I don't yet know question 6 sorry