BIOLOGY MIDDLE SCHOOL

What must happen before chemical reaction can begin

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Answer 1
Answer: chemical reaction is a ... molecules of the reacting substances must collide before any potential reaction

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What is an example of a non-renewable resource ?​

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natural gas or coal or nuclear power

Answer: Non- Renewable sources can be coal, oil, gas, energy,  and more!

What happens when the hypothesis is wrong

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If the hypothesis is wrong, it doesn't exactly mean it is a failed experiment. Many scientists have failed their hypothesis and studied their data/facts to record a new hypothesis. 
If the hypothesis is wrong they can recreate it again, or if they try many recreations, it can be just consider as a wrong hypothesis

Photosynthesis is crucial to life on earth in another way besides as the main food supply. What else does photosynthesis continually supply?

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Photosynthesis produces oxygen, which we use to breathe.

A model is useful if it’s what ? A.explains new observations.
B.predicts new observations.
C.matches new observations.
D. All of the above.

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I am pretty sure the answer is all of the above, D
The answer should be D!

The outside of a bacterial cell is protected by a structure called a

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Cell wall or cell membrane depending on if it is animal or plant cell. Only plant cells have a cell wall.

Why do you think a growing human population means a mass extinction event for Earth’s animals? Cite your evidence.

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Hello,

A “biological annihilation” of wildlife in recent decades means a sixth mass extinction in Earth’s history is under way and is more severe than previously feared, according to research. Scientists analysed both common and rare species and found billions of regional or local populations have been lost. They blame human overpopulation and over consumption for the crisis and warn that it threatens the survival of human civilization, with just a short window of time in which to act.

Hope this helps!!!! Happy Holidays!!!! (:
Other Questions
What is sustainability?O the number of organisms in an areaO being able to continue for a long timeO the variety of organisms in an areaO being able to grow larger over time
Fusion is the division of atomic nuclei. True False
The density of an object with a volume of 60.0ml and a mass of 400.0g is ......???
Is halite more valuable than gold?