What is the main function of lysosomes? A.
They break down and remove waste materials.

B.
They keep contents separated from the outside.

C.
They fill the cell with fluid.

D.
They are used as the information center.

The transport tubes for food coming down the plants are called?

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.

Explain how scientists use geologic time to determine the age of landforms.