help please, parathyroid glands produce hormones that are essential to the proper function of which system

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.

Which of the following is not associated with invasive species?