What is light dependent stage?

What is thought to have caused the mass extinction at the end of the cretaceous period?

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.