The calvin cycle and the krebs cycle are referred to as cycles of chemical reactions because they occur inside organelles. start over continually. are part of the carbon cycle. allow energy to flow in ecosystems.

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms

Fossils of ancestors of the modern horses show a small 4-toed almost dog-like browsing animal named eohippus over time the horses got larger lost toes and changed to a grazing diet what is the best explanation of why this change occurred