Which best describes a gene?

different allele forms of a trait

tightly coiled strands of DNA

the center of a chromosome

a segment of chromosomal DNA

Which weather phenomena is not influenced by the ocean?

Wdat are organisms that produce their own food called

All layers of the cean have the same amount of oxygen

If a substance is completely consumed in a chemical reaction what is the substance? A. Limiting reactant B. Reactant C. Product

What benefits do nitrogen-fixing organisms provide in an ecosystem? A. they release nitrogen compounds into the air B. they convert nitrate into gaseous nitrogen C. they turn atmospheric nitrogen into organic nitrogen compounds. D.

In a plants stem the vascular tissue is A. is always arranged in rings of vascular bundles B. is continuous from the roots to thel leaves C. carriers nutrients up the stem but not down D. plays a role in photosynthesis and storage.

During which stage of sex cell formation does the number of chromosomes decrease from diploid (2n) to haploid (n) ? a. prophase 1 b. prophase 2 c anaphase 1 d. anaphase 2

What would most likely interest an environmental scientist

Do you believe you have a personal responsibility to protect the environment

What happens to the total charge of the compound after the ions bond together?