Phytoplankton are microscopic photosynthesizing organisms that typically live in the upper layers of the ocean. What trophic level do phytoplankton belong to?

Primary producers

Decomposers

Primary consumers

Secondary producers

Which procedure could a student use to examine an intensive property of a retangular block of wood

1234567891011 Why isn't DDT an ideal pesticide? Select all that apply. It did not work well at wiping out the insect population. Over time insects started to become resistant to DDT.

Why do scientists say that most of the mass of an atom is located in the nucleus?

Refraction is the bending of light as it changes in speed and direction when entering a medium. After light enters the substances (medium) listed; in which order will light travel the slowest to fastest?

What is the mass of sodium chloride used to make 100mls of a 1.0M sodium chloride solution?

The ionic naming rules

What is the PH of a solution whose [H+] is 0.0007

What was concluded about the structure of the atom as the result of the gold foil experiment? (1) A positively charged nucleus is surrounded by positively charged particles. (2) A positively charged nucleus is surrounded by mostly empty space.

Andre is predicting the products of chemical reactions. In one reaction, a hydrocarbon is the only reactant. What is the best prediction and explanation of this reaction? Two new compounds form as the hydrocarbon undergoes a synthesis reaction.

What evidence is there that electrons move around in definite pathways around the nucleus? What evidence is there that electrons m