In an experimental investigation, the variable that the researcher changes or manipulates in order to see its effects is called the variable.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

the answer is d. none of the above

answer; the code in musculoskeletal system subsection is associated with deep tissue possibly to the bone;