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Agata [3.3K]
2 years ago
8

3. When (what year) were stone tools first used?

Biology
1 answer:
Dima020 [189]2 years ago
4 0
Stone tools we’re first used around 3,300 BCE
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Whitch of the following statements are true?
maria [59]

Answer:

All the statements are true except the second i. e. the soil quality in an ecosystem Does not matter as much as soil quantity.

Explanation:

In an ecosystem both quality and quantity of water is very important. If the quality of water is not suitable, that it contains polluted substances so the health of the organism such as fishes and other aquatic animals will adversely affected and sometimes dealth occurs and the ecosystem will be negatively affected.

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gregori [183]

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Endonerium

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True, the model had to change as new information came to light.

After the invention of new instruments, it enable us to do more research and verify old theories.

Dalton atomic theory states that matter is composed of very small particles called atoms which is indivisible. Indivisible means cannot be broken down into simpler substances. But Rutherford performed an experiment and concluded that atom is divisible into proton, electron and neutron. Electron is present in the shell while proton and neutron are present inside the nucleus of an atom.

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