<h2>
Answer: c
. Alkaline earth metals (Group 2)</h2>
<h3>
Explanation:</h3>
Group 2 metals have 2 electrons in their outer shell. These two electrons are usually found in the s orbital, hence the s².
It's Co just look at the periodic table
Sawing a board in half is a physical change not a chemical change the board doesnt change wood or whatever material it is is still would still be wood
If it were burned it would be a chemical change but its properties stay the same atomically so thats why its not a chemical change.
Answer:
C. air pollution absorbs carbon dioxide
Explanation:
Carbon dioxide's role in the greenhouse effect is a major contributor to air pollution. Radiation and heat emanating from the earth's surface need to be released out into the atmosphere. But because carbon dioxide levels are so high, there is an ozone effect on the ground level.
D. Parasitism , the roundworm benefits from the relationship, but the puppy is harmed
