Aswer fast! despite their blank structure, human bones are surprisingly blank. a hollow; string b solid; lightweight c compact; flexible d spongy; fragile

Chlorophyll is found in plant leaves and absorbs light from the sun to enable plants to perform photosynthesis. magnesium is an important component of chlorophyll. the concentration of magnesium ions is higher in the root-hair cells of plants than in the soil. which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll? osmosis diffusion passive transport active transport

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird