100 point question! what percent does dark mass total mass–energy take of the universe?

Which element provides strength to the exoskeleton of clams and oysters

The term used to describe a disease-causing microorganism isa. virus.b. infection.c. pathogen.d. microbe.e. bacterium.

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?