Answer:
<u>Two ureters.</u>
These narrow tubes carry urine from the kidneys to the bladder. Muscles in the ureter walls continually tighten and relax forcing urine downward, away from the kidneys. If urine backs up, or is allowed to stand still, a kidney infection can develop.
Answer: c. symbiotic mutualism
Explanation:
Mutualism is a symbiotic relationship in which both species benefit
Answer:
C, distance
Explanation:
Distance and mass are two major factors that affect the strength of the gravitational force.
