D
A describes liquid, b describes solid, and c describes solid as well. therefore d is the only good answer
Answer:
Autotrophs
Explanation:
They are responsible for the production of food. Root words "auto" for self and "troph" for food.
Alpha particles are released by high mass, proton rich unstable nuclei. The alpha particle is a helium nucleus; it consists of two protons and two neutrons. It contains no electrons to balance the two positively charged protons. Alpha particles are therefore positively charged particles moving at high speeds.
