Which of the following does not rely on active transport to cross the cell membrane? A. calcium ions B. water molecules C. potassium ions D. sodium ions

Substance in the atmosphere that harm an organism being and alter the environment in which they live, are known as what? A) atmospheric pollution B) UV radiation C) solar input D) greenhouse effect

One way to tell that an explanation is pseudoscientific rather than scientific is to

Which of the following reproduces by injecting its material into a host cell? * Parasite Virus Bacterium Microorganisms

Makers of generic drugs are required to show that their generic drugs do not differ significantly from the "reference" or brand name drugs that they imitate.

Which idea best describes why the volume of water in Earth's oceans changes? Large amounts of ocean water are lost to the mantle within rifts. New water is constantly added to Earth's oceans by space objects.

Explain how blood is prevented from flowering backwards in the heart

He phase of the cell cycle where dna replication, chromosome duplication and preparations for cell division occur is called

Why do you think phytoplankton are so important to all living things on earth?

The weakness of hydrogen bonds between the bases of DNA allows what?

Which statement is correct? The number of electrons of a neutral atom always equals the number of protons. The number of neutrons always equals the number of protons. The number of neutrons always equals the number of electrons.