Which of the following is an element?
orange juice
hcl
acid
oxygen

Which of the following is an example of a parasite?

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Express the following number in scientific notation. 0.026890 =