Which of these Paleozoic periods is the youngest?

a. Permian

b. Devonian

c. Ordovician

d. Pennsylvanian

Protists are a diverse group of organisms that are similar in

Why are bacteria a necessary part of the nitrogen cycle? Other living things cannot use atmospheric nitrogen. Other living things cannot use the nitrogen in plants. Bacteria are the main nitrogen reservoir.

What is the function of the cell membrane?

Why is a complex food web better than a simple food chain fr the survival of a community

The movement of particles from high to low concentration is: passive transport active transport

Organisms that have groups of specialized cells organized into organs are always

What is a cell how does it effect the body

A farmer crossed a yellow maize plant (Yy) with another yellow maize plant (YY). He planted 200 seeds from this cross. How many of the plants would be yellow?

How do the methods of scientists lead to knowledge?

Actions you do without thinking about them