Answer:
Chemical evolution is the formation of complex organic molecules from simpler inorganic molecules through chemical reactions in the oceans during the early history of the Earth.
It the first step in the development of life on this planet
HOPE IT HELPS!!!!
Trying to determine whether a fossil is a human ancestor, we should always look for skeleton or bone that make us human today.
<h3>What is bone?</h3>
Bone is a connective tissue which is metabolically active and the main function of bone is to provide mechanical or structural support as well as perform movement, and protect important organs of the body.
The bone is made up of bone cells known as osteocytes and extracellular matrix. The total number of bone human body contain is 206 bones including bones of spine, legs, arms, ribs, and skull.
Bones are made up of calcium and carbonate and they have bone marrow in which blood cells are produced. By nature bones came in category of living and they are active tissue .
There are several types of bones such as flat bones, short bones, sesamoid bones, and long bones. The function of bone is to protect vital organs of the body.
Therefore, trying to determine whether a fossil is a human ancestor, we should always look for skeleton or bone that make us human today.
Learn more about bone here:
brainly.com/question/5482443
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Answer:
I want free points so here's my fake answer :)
Answer:
D.
Explanation:
Of the 23 pairs of chromosomes, the X and Y are the pair that determines the sex of the child. X chromosomes stand for female, while Y chromosomes stand for male.
XX means a female
XY means a male
Hope this helps!
Answer:
Answer B
Explanation:
The traits have to have variation and get passed on to children other wise it cant happen
