Molecules with similar shapes have similar biological effects, because shape (structure) dictates effects (functions).
Answer:
Here's what i think.
Explanation:
Tides can be extremely dangerous, in some places, high tide will flood caves which people otherwise wouldn't notice as flood-able. Knowing the tides can save lives of Spelunkers (people who explore caves). Another example is sailing. The tides can be important because tide can determine if your boat will be smashed against rocks, or if it is safe to dock!
The answer to this question is stage 2 - Mitosis
The answer would be light. Light is needed in plants so that they can do the process of photosynthesis.