Which evolved during the Paleozoic Era? A. saber-toothed cats B. the first humans C. bacteria that could produce oxygen D. earth's first land plants

43) Hybridization and genetic modification are two methods to improve the annual yield of crops, get better seed and fruits, and produce disease-resistant crops. What is a reason for choosing hybridization over genetic modification?

What cells and substance would you expect to find suspended or dissolved in plasma

Skeletal muscle is covered, surrounded and protected by various layers of connective tissue. Which layer of connective tissue would surround a bundle of muscle fibers (muscle cells) ?

Explain why cells divide at different rates

Which is the best definition of activation energy? the energy required to end a chemical reaction the energy required to bind a substrate to an active site the energy required to form or break the bonds of reactant molecules the energy required to

Why must experiments be repeated many times

Why is a nucleus found in both plant and animal cells?

Explain three disadvantages to using an electron microscope to view microorganisms.

What are the two strands of dna held together by?

Using context clues, what does predecessors mean as it is used in the first paragraph