Answer:
The cell is the structural and functional unit of all living organisms, and is sometimes called the "building block of life".
Explanation:
Explanation:
No because a speech has to be a meaningful speech
The could tell by solar radiation and dark matter, they didnt know were dark matter was but they new it was there
10.Which of the following is a tool that is used by astronomers to study radiation ?
B) A ground based telescope.
11.Which of the following is evidence of earth's revolution ?
D.constellation movement.
12.Which of the following forms of radiation can be shielded by earth atmosphere ?
A.Gamma rays.
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