What is the system that performs the collection of glands that secrete hormones into the bloodstream? A. Nervous system
B. Endocrine system
C. Lymphatic system
D. Immune system

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

What function does a limb serve in each animal how are the limb bones of the four animal similar based on the similarities what can be inferred about the evolution of the poor animals

Gene expression is the activation of a gent that results in a question 1 options: protein dna mitochondria