Robert Paine studied sea stars in the intertidal zone along the northern Pacific coast. When he removed sea stars from a study area, their prey, two mussel species, increased exponentially. This crowded out other species, and the overall biodiversity of the community was greatly reduced. What role in the community did the sea star play?
a. Pathogen
b. Keystone species
c. Producer
d. Prey species

Which part of cellular respiration must occur before any of the other steps can occur

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.

Graded assignment lab report answer the questions below. which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.