Historical models of the solar system included a model or earth-centered universe and a model or sun-centered universe.

The bottom area of a pond or lake where very little sunlight reaches is the O trophic zone O plankton zone littoral zone O benthic zone

A scientist conducts a study to determine the effects of the mineral cadmium on the weight of mice. She adds 5 mcg of the mineral to the daily diet of 100 4-week-old laboratory mice. Every week, the researcher records the weight of each mouse.

What chemical in the nucleus regulates protein synthesis?

Prokaryotes and eukaryotes both have A. DNA. B. ribosomes. C. both (a) and (b). D. none of the above

Water soluble molecules often enter or exit a cell in what process? a. Osmosis c. Facilitated diffusion b. Simple diffusion d. Active transport

Air pollution is caused by A. natural events and human activities. B. human activities but not natural events. C. heavy rainfall. D. the sun.

Which of the following can increase the growth of algae when it enters streams? A) insecticide B) herbicide C) carbon dioxide D) oil

Which are the best examples of types of molecules used for energy storage by organisms? Choose all answers that are correct. A. lipids B. proteins C. nucleic acids D. carbohydrates

Tell me five different invasive species

How much energy is produced by each type of macromolecule