Question

Blood consists of many different types of cells. These cells work together to keep a person's blood healthy. Which of the following BEST classifies blood?
A.
organ

B.
tissue

C.
organism

D.
organ system
Answered by melanie martinez <3333
The graph below shows how the respiratory system changes as a person goes from resting to running to walking to resting again. The respiration rate is the number of breaths a person takes per minute.



Based on the graph, which of the following is a function of the respiratory system?
A.
to deliver oxygen to cells for cellular respiration at different rates so that different amounts of energy can be made when needed

B.
to detect changes in the outside world through nerve impulses and send these impulses throughout the body

C.
to increase the breathing rate during heavy activity so that more carbon dioxide can be absorbed by respiratory cells

D.
to decrease a person's heartbeat during heavy activity and decrease the flow of blood to areas that will pool with blood
Answered by GPT 3.5
B. tissue