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

Que es un eucariota

Se pueden utilizar los desechos de las cianobacterias como arma biologica?

After the egg is fertilized what type of cell division occurs

Fossils are remains or evidence that organisms lived in the past. Ex: footprints, borrows, bones, body casts, etc) A: True B: False

The domestication of dogs has led to a. a variety of reproductively isolated breeds. b. a variety of phenotypes. c. a variety of homologous structures. d. a variety of different species. a variety of mutations.

In theory the enzymes should work in colder conditions but at a lower rate, why?

Cyanobacteria have been engineered to produce isobutanol directly. What advantage does this have over other alternative biofuels? a. It is an inherently renewable fuel source. b. Multiple processing steps can be avoided. c.

Describe the appearance of dense connective tissue

What us one role that lipids play in the boy

Which meninx surrounding the central nervous system contains blood vessels that nourish the neural tissue?