What organisms "fix" nitrogen, which allows plants to make amino acids?

What does "mapping" refer to in the process of cell differentiation?

Mutations in certain genes of bacteria cause them to be resistant to powerful antibiotics. What type of mutation is this for the bacteria? A: beneficial B: harmful C: neutral D: both beneficial and harmful

Which Matt it is most likely used to that by what happened before the start of the Paleozoic era

What is larger tissue cells or a nucleus

About 43% of blood consists of red blood cells. true or false

Which type of fossil is bone or tooth that have been covered by layers of sediment and preserved into stone. Body Fossil Mold Fossil Resin Fossil Trace Fossil

What determines how many trophic levels a rain forest ecosystem can support?

Match the meaning to the word part

The process in late pregnancy when the fetal head begins to decend into pelvis.

Why can flowers rapidly germinate?