An association between two different organism in which one benefits and other is harmed.

a. endosymbiotic
b. mutualism
c. parasitism
d. commensal

case study case study case study case study case study case study case study case study case study case study case study

The terrestrial planets are characterized by having a a.) silicate core b.) iron-rich silicate core c.) iron-rich metallic core d.) none of these

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils