Sedentary activities would be sitting down, and being a couch potato
So the main difference in the 4 answer choices would be that 1 is sitting down
And the other 3 would be moving around.
Jogging (moving around)
playing video games (sitting down)
playing basketball (moving around)
riding your bicycle ( moving around)
the answer is video games!
Good Luck! :)
A. The diaphragm is a smooth muscle.
Myofibrils are composed of long proteins including actin, myosin, and titin, and other proteins that hold them together. These proteins are organized into sections called sarcomeres.
The answer should be D. Here are a few references I used.
Website with information: https://study.com/academy/lesson/myocardium-definition-function.html#/transcriptHeader
You can always ask Google, your best friend :)