Carbon dioxide is called a greenhouse gas for which of the following reasons? A
It absorbs and reradiates infrared radiation to warm the Earth.
B
It is produced when coal and/or fossil fuels are burned.
С
It is often used inside greenhouses.
It's oxygen component is needed by plants to grow.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

but there is no

i guess you forgot putting it.

it is either c or d and i know for sure it is not a or b

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.