How long were simple microsocpic organisms the only life forms on earth?

Which of the following is not a characteristic of lakes? A) deeper than ponds B) lack of waves C) found in mountainous regions D) larger than ponds E) fed by rivers

What does the Murphree Water Treatment Plant use to disinfect the water? a. chlorine. b. phosphorus. c. oxygen. d. nitrogen. e. iodine.

How can a microscope be used to determine if the specimen is a living thing

7. Which of the following is not a group of invertebrates? A sponges B mollusks C fishes D cnidarians

Carbon is transferred from seawater to atmosphere through the process of diffusion excretion photosynthesis respiration

How many kilometers has the left side of the pacific basin spread in 2 million years

What is the role of beta phenylethyl alcohol in pea and how does it work?

Drag the correct description under each cell structure to identify the role it plays in the cell. converts chemical fuel into packets of chemical energy (atp) that can power the cell strong, protective structure made from cellulose fibrils makes

What is the 3rd trophic level called

Roberto is a teenager who is going out with friends to a movie. On the way back home, they decide to stop to grab some food. Roberto is health conscious. What kind of snack would you suggest? A. low protein B. calcium rich C. high calorie D.