Select the most correct statement.
a. the immune system is closely associated with the lymphatic system.
b. the endocrine system is not a true structural organ system.
c. organ systems operate independently of each other to maintain life.
d. organ systems can be composed of cells or tissues, but not both.

Ineed to know why d is the correct answer asap

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

What type of pollution does household garbage cause