What are the chemical elements necessary for life?

Which of the following is the largest particle in soil? A-clay B-sand C-silt D-humus

Why should you not use model organisms for genetic engineering?

What type of organisms were dominant after each mass extinction?

What do you call a subsoil that stays permanently frozen?

Which of the following traits evolved multiple times over the course of the evolution of vertebrates? a. Hair b. Flight c. Oviparity d. Homodonty

How is the fish near the bottom of the ocean adapted to living in the dark?

What might happen to the organisms in the food web below if the number of phytoplankton and vegetation drastically decreased? The small fish and wading birds would be affected. Only the small fish would be affected.

There are two different alleles for flower color, P and p. Which is the genotype of the sweet pea? Heterozygous dominant heterozygous recessive homozygous dominant homozygous recessive

Veronica got a cut on her arm, and it started bleeding. Her circulatory system started working hard to prevent blood loss and protect against infection. Which two components of the blood were functioning at a higher level than normal?

1. Can bacteria or viruses be seen with the naked eye?