Answer:
A
Explanation:
A is right
I think. But I am not 100 % sure
Take a compound microscope for example, the advantage of this common tool is to magnify a smaller object to make it view clearly. However the disadvantage is if you roll up the course adjustment knob too much the lenses will crack and you will have to give up some money.
Answer: B) R group
Explanation: An aminoacid is composed by an amino group, an acid or carbonyl group and a side chain or R group, all bonded to a central carbon atom. Aminoacids are different between them for the R group and can be classified as: 1) Non-polar Neutral if the side chain is uncharged and non-polar (aliphatic or cyclic). 2) Polar Neutral if the side chain contains amida, sulfur or hydroxyl groups. 3) Basic if the side chain contains other amino groups. 4) Acid if the side chain contains other carboxyl groups.
Answer:
C) They show plants and animals that once existed but do not exist now.
