Which describes the average velocity of a unicycle going around in circles
( there can be more then one answer)

a. the total displacement divided by the time
b. every time the unicycle returns to its starting point, the average velocity equals zero.
c. the average acceleration divided by the time
d. the slope of the acceleration vs time graph

b

explanation:

the glands which are associated with each description is given below:

gag reflex, poor dentition, gum retraction

have a good day

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.