Which of the following human activities can cause eutrophication of lakes? question 10 options: 1) adding fertilizer to soil 2) mining 3) deforestation 4) burning of fossil fuels

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Which describes fat? a: a carbohydrate that produces energy b: a nucleic acid that directs cell function c: a lipid that stores energy d: a protein that speeds up a chemical reaction

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.