Roundworms live in an organism's intestines, and usually cause disease. The relationship between the roundworm and the organism in which it lives is BEST described as a . A.
predator–prey relationship
B.
parasite–host relationship
C.
consumer–producer relationship
D.
consumer–decomposer relationship

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.

According to cell theory; which structures carry out the basic function of living things? a. atoms b. organs c. cells b. nuclei

Abeaker of water was heated and then placed on a bench in the laboratory. the water cooled until it was the same temperature as the air in the laboratory. which of these explains the mechanism by which the water cooled? a. heat energy was transferred from the water to the air. b. water molecules from the water formed warm water currents. c. the water molecules absorbed energy from the molecules in the air. d. the water released radiation until it contained no heat energy.