In a marine food chain, small fish eat plankton, big fish eat small fish, and sharks eat big fish. Which organsim has the smallest population?

Manipulating the dna inside cells to improve production of materials or the material itself is called

Choose all the answers that apply. Which of the following is a source of watershed pollution? pesticide fertilizer animal waste trash in chemical spills

a nitrogen atom has 7 protons, and the most common isotope of nitrogen has 7 neutrons. A radioactive isotope has 9 neutrons. What are the atomic numbers and mass numbers of the stable and radioactive forms of nitrogen?

What do you call the flexible layer which separates the inside of a cell from the environment? A. nucleus B. ribosomes C. cell membrane D. mitochondria

In Wisconsin, a very large population of lake trout, in which individuals mate at random, experiences no migration, mutations, nor selective pressure for a number of years. Which of these is most likely to occur in the population?

Which structure secretary's hormones directly into the bloodstream without using a duct A) lacrimal gland B) adrenal gland C) oil gland D) salivary gland

Disorder affecting one or more nerves where they exit the spine

What senses is associated with the temporal lobe?

What are 2 ways nitrogen becomes usable to plants, humans and animals?

What factor has the greatest effect on species diversity