Which two organ systems work together to perform gas exchange and deliver oxygen to the rest of the body? A. Digestive & cardiovascular
B. Respiratory & cardiovascular
C. Respiratory & excretory
D. Skeletal & muscular

Autotrophs a. consume their food to get energy b. may use photosynthesis to gain energy c. are also called consumers d. cannot use solar energy

Ascientist discovers a new body between the orbit of neptune and the kuiper belt. the object is round and travels in an orbit around neptune with other space objects. the scientist claims that she has found a new dwarf planet. where is the scientist’s error?

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy