In 3–5 sentences, compare and contrast the flow of matter and energy in each trophic level for land-based ecosystems and marine ecosystems. How and why are they similar, and how and why are they different?

About __ of the mass of the cell is water

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

Do the following statements describe actin, myosin, both of the proteins or neither of the proteins? (a) contains a binding site for calcium (b) found in the i band (c) exists in a globular (g) form and a filamentous (f) form (d) contains a binding site for atp (e) is a component of the thin filament (f) is a component of the thick filament