12. Having tissues that digest food, such as in the jellyfish, is an example of (a) cell-level organization.

(b) tissue-level organization.

(c) organ-level organization.

(d) organ system-level organization.

When it is summer at the south pole, a. the northern hemisphere is tilted toward the sun. b. the southern hemisphere is tilted away from the sun. c. the northern hemisphere is tilted away from the sun. d. both the southern and northern hemispheres are tilted toward the sun.