According to the geologic time scale, in what era did most types of animals first appear

Which of the following carbon compounds provides an important building block for cell membranes? A. Nucleic acids B. lipids C. Proteins D. Carbohydrates

What would happen if the paramecium didn't have a contractile vacuole

Which Biome is the Texas?

Check out this potato plant. We eat lots of potatoes. They are considered to be (1) a vegetable and (2) starchy. Starches are made up of three or more sugars. If plants make sugar, then what elements must be found in starches?

Which statement best describes the exosphere? 1.) It extends down to sea level. 2.) It is the place where meteors burn out. 3.) It is the layer where we observe lighting. 4.) It is the last layer of the atmosphere before space.

Describe he characteistics of science

Which type of volcano does not form a mountain

The process by which green plants make food is called a. photosynthesis. b. cell division. c. mutation. d. fertilization.

This is a molecule that contains both amino and carboxylic acid functional groups. They are the building blocks of protein.

Some of the most primitive organisms found in the fossil record are