Which two body systems work together to deliver oxygen to cells? A. the digestive and respiratory systems
B. the respiratory and circulatory systems
C. the digestive and circulatory systems
D. the circulatory and excretory systems

B

Explanation: the respiratory system includes your lungs, etc., which help you breathe, and the circulatory system is what circulates oxygen through your body.

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

-lavira: )

the answer would be..

b. sucking