Answer:
Russia concerned both of them because at that time in the war Russia was the powerhouse, they had it all, technology wise and climate wise. They could not be attacked because of their harsh winters and they could attack at any time because they had the upper hand in military technology.
Heat causes chemical reaction so that might be a way in which people use chemical properties to separate one substance from another substance .
Answer:
On average, woody plants, such as trees, have greater genetic variation than vascular plants, such as grasses. The extent of each species' geographic range and how far they can transfer their genetic material, such as by wind pollination or animal seed dispersers, account for some of the diversity.
Explanation:
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I think the answer is a b and c
