The answer is 100%. Three are observable, but the fourth is just a carrier.
Littering, hunting specific endangered species, honestly there are tons of things so the easiest one would be littering because if animals eat certain things it can kill them.
Stand on two feet, walk in a straight line and be careful to not trip/step on anything that could make me lose my balance
Answer: True
Explanation:
Dysmenorrhea can be define as a condition in which pain occurs during menstrual cramps, that is due to uterine contractions.
Primary dysmenorrhea can be define as commonly occurring menstrual cramps. The secondary dysmenorrhea results from a disorder and pain in the reproductive organs.
