What units are used when describing the length of time that the universe has been expanding?

billions of years

millions of years

light years

light year kilometers

decades

If you add salt to water, then the water won't freeze as fast as it would if there was no salt.

How many different amino acids are responsible for making up the thousands of different proteins found in a cell? 3 15 thousands 4 20

Which word refers to the smallest functional unit of a living thing? cell eyelash organ tissue

What is the function of the electron transport system?

Speciation that results from the formation of a geographic feature that isolates some members of a population from other members is an example of: a. allopatric speciation b. directed speciation c. stabilizing speciation d. sympatric speciation

The plasma membrane is composed of several different macromolecules which macromolecule serves as the fluid interface between the intracellular and extracellular environments

The table above shows five different types of chromosomal abnormalities that can occur during meiosis. They result in either an individual having too many or too few chromosomes in their genome.

During which stage of disease should an infected person be considered contagious

A scientist observed the boundrary between teo tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. Does this result suppor the theory of plate tectonic? Why or why not?

Do you think the channel on Mars was formed by flowing water or flowing lava