Which were the earliest oxygen-producing life-forms?

a. cyanobacteria.

b. seaweed.

c. dinosaurs.

d. ferns.

How does the soil-based view of the phosphorus cycle compare and contrast with the global view of the phosphorus cycle

What is the connection between poverty and soil erosion in developing countries?

What is the difference between plants and animals even though they are both in the eukaryote domain?

Three examples of bacteria billions of years ago

What are the 3 contributing factors to ecological succession

What is a type of research that involves observation and collecting data but does not include control

Forms of the Ras protein found in tumors usually cause which of the following? A) DNA replication to stop B) DNA replication to be hyperactive C) cell-to-cell adhesion to be nonfunctional D) cell division to cease E) growth factor signaling to be

Which property of nervous tissue is fundamental to its function of coordinating the body's activities? O cells that are tightly packed contains extracellular matrix presence of neurons short life span

Polydactylism is a dominant trait that results in extra fingers and toes in humans. A polydactyl man marries a woman with 10 fingers and toes. They have a child that has a normal number of digits.

Why are some sediments smaller than others