When magma cools off earth's surface, which type of crystalline structure is usually found?

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

The influenza virus cause the flu, but not other diseases. why?

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above