How long ago did homo sapiens aprears

List charasteristics of athenosphere

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

Which of the following is the best definition for the process of photosynthesis? a.) plants digest sugars to make energy. b.) plants use oxygen and glucose to make carbon dioxide. c.) plants use sunlight and carbon dioxide to make sugars. d.) plants use sunlight to make chlorophyll and chloroplasts.