Fluorine has an atomic number of 9. Then n=1 energy level has two elections, and the n=2 energy level has seven electrons. Fluorine's valence is ___.

A) + 2

B) - 2

C) + 1

D) - 1

Which of these has only prokaryotic cells? A) fungi B) plants C) animals Eliminate D) bacteria

The __ is a tiny filtering unit in the kidney

Which of the following is the single largest component of a typical soil? Air Moisture Minerals Organic material

Assume you inoculated 100 cells, with a generation time of 20 minutes, into 100 ml of nutrient broth. You then inoculated 100 cells of the same species into 200 ml of nutrient broth.

Why are peas a good model system for studying heredity

Both viruses and cells are able to replicate their genetic material. What is the main difference in their replication processes?

How many atoms is in this formula? 2C12H6O6

Explain the reason that many organisms found in the oceanic zone are unique and cannot be found anywhere else. Be sure to include two ways organisms have adapted to live in this zone

A species of fish is introduced into a lake the fish is better at hunting for food than the old fish. the old fish die off, the new fish population increases. which is the best way to describe these fish in the new ecosystem

Some populations of bats live in areas with high levels of noise pollution, such as near heavily trafficked bridges. How might the hunting behavior of bats be affected by such an environment?