Answer:
True.
Explanation:
The generation time of that species would determine the time needed for bacteria in the culture to multiply to a sufficiently large number of cells that can be observed as visible colonies.
Answer:
Pick Hydrogen, but read below.
Explanation:
The blacks are Carbon. They have 4 connections. The left Carbon has 3 whites connected to it. It is not totally an exclusive answer, but the whites could be anything in Column 17 (F, Cl, Br, I) or Hydrogen. Likely it is hydrogen.