21.   The whole ecosystem there is based on microscopic free-floating organisms called phytoplankton, which are eaten by tiny shrimplike crustaceans called krill.

22.   They reported finding mineral and organic chemical traces that could be produced by biological processes and also possible fossils of microscopic organisms.

23.   Two parasites in particular, tiny brown sea lice and a microscopic organism called Gyrodactylus salaris, literally cover salmon and kill them by eating their flesh.

24.   Why not transport students across the globe or back in time, or inside models of microscopic organisms and hold classes there instead?

25.   It can destroy some microscopic organisms and damage some plants.

26.   One such algal bloom is red tide, a microscopic organism that colors the sea and can be toxic to humans and marine life.

27.   Such radiation can cause sunburn and skin cancer, destroy some microscopic organisms and damage some plants.

28.   That radiation can cause sunburn, skin cancer, destroy some microscopic organisms and damage some plants.