Which of these body systems has cells that attach to each other to form a leak-proof barrier? Select one:

Endocrine system.

Respiratory system.

Reproductive system.

Urinary system.

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt