1st one is E
2nd one is also E
Answer:
A pure substance has a definite chemical composition
Explanation:
The answer is halogens
Halogens are reactive non metallic elements that form strongly acidic compounds with Hydrogen to form simple salts
C. Theres decreased Biodiversity Most likely because of natural or human causes (deforistation)
1 is seconds and meters m/s
2 is seconds and meters m/s^2
3 Newton kg/m
4 Kilograms
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