3 Select the correct answer.
Why does your heart never tire of constantly beating to pump blood throughout your body?
OA. It belongs to the skeletal muscle group, which means it moves involuntarily.
OB. It consists of fibers that move voluntarily, so you can train these fibers to increase their endurance level.
ОС. . It has a high level of muscular strength due to extensive weight training.
OD
It consists of cardiac muscle tissues, which means it moves involuntarily.
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It consists of cardiac muscle tissues, which means it moves involuntarily, maybe this is the answer?

for me i have felt invisible when i was clearly struggling,or,i made a great achievement ,and,nobody took to notice me either because they just didn't see it,or,people just turned their back on me.i can see a person being invisible by choice,or,without choice like i did.the people who are invisible by choice don't try to talk to people,don't try to make friends,and,keep to themselves.i haven't been one of those people so i couldn't give you a reason.

hope this and can i get bainliest my dude : d

gynecologist i believe