Answer:
Because it is made up of organs that act as a system
Explanation:
The integumentary system, skin, has been referred to as a membrane and an organ, but it is more commonly referred to as a system since it contains organs that operate together. Because it surrounds the body and comprises multiple types of tissues and a membrane, it is sometimes considered an organ.
Answer: Because they have built up immunity from past medications.
Explanation: As people get sick and are given antibiotics the 99.9 % are removed but that one percent from the bacteria is able to overcome the antibiotics and make itself stronger and immune to the medicines, then the bacteria evolves and a new person will get infected and will need stronger antibiotics further more the cycle is repeated.
B) they have thick, pleated stems
Intercalated disks support the synchronized contraction of cardiac muscles
Answer:
Your body is all your physical parts, including your head, arms and legs
