Glands secrete different types of directly into the bloodstream. 10 points
hormones
neurons
signals
enzymes

Fossils can only be formed when? if mud, silt or tar is in the area to preserve the fossil ierosion does not occur and allows the fossil to form oxygen and microorganisms cannot decay the bones the area is dry and does not contain mud or silt

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast

How do all types of diffusion/passive transport actually ‘work’ without using even the smallest amount of cellular energy?