The human circulatory system and respiratory system work together to help the body maintain homeostasis, its balance. Which of the following is a result of the effort between these two systems? A.
The intake of oxygen

B.
The intake of urine

C.
The intake of salts

D.
The intake of carbon dioxide

Oxygen and nutrients are moved through the body by the: a. circulatory system c. lymphatic system b. digestive system d. reproductive system

Which articulations allow for greatest range of motion?

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?