Oceanic are deep valleys on the ocean floor, some having depths of over seven kilometers. A. trenches

B. ridges

C. plains

D. plumes

Explain the importance of producers, primary consumers, secondary consumers and decomposers in an ecosystem.

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.