Of the following ecosystems, which has the lowest net primary productivity, measured as kilocalories of energy produced per square meter per year?

True or false About half the photosynthesis on earth is preformed by phytoplankton

What process can account for a normal xy male producing a sperm carrying two y chromosomes?

Which of the following do all disease-causing viruses need in order to reproduce? A reverse transcriptase B the equipment of the host cell C amino acids D a signal from other viruses

How do producers get their food when they're not being exposed to sunlight? A. breaking down algae B. breaking down carbon C. breaking down inorganic compounds

A trait has two alleles, which are represented by p and q. if p = 0.07, what is q?

Which one of these equations applies to a bond that currently has a market price that exceeds par value?

What is the science that deals the study of human beings?

You have AB + blood. Your spouse has AB - blood. What is the probability that your first child will have O - blood?

Which type of plant cell is undifferentiated?

Oxygen is moved around the body of an echinoderm in its A) madreporite B) bony plates C) water vascular system D) arms