Before photosynthesis evolved, ___ was rare in earths atmospherer

In prokaryotes, rho-independent transcription termination depends on a secondary structure formed in

Farmers are often known for using nitrogen rich fertilizers to ensure ideal crop yields but this also often leads to an increase of which of the following? A. Burning of fossil fuels resulting an increase in emissions of greenhouse gasses B.

Gametes have A) homologous chromosomes B) twice the number of chromosomes found in body cells C) two sets of chromosomes D) one allele for each gene

How can genetic variation and environmental pressures cause a change in an organism

8 protons 9 neutrons and 8 electrons is

What would happen if a keystone species is removed from an ecosystem

Which material will displace a volume of water? all of them cork and wax iron, lead, and aluminum none of them Which material will displace a volume of water less than its own volume?

Why is mitosis responible for for growth, repair, and maintence

Explain one way in which a hormone can prevent contraception

1) Which of the following explains why a bone in a bird's wing is homologous to a bone in a lizards leg? A) The bones in the two species provide for the same type of motion.