For several days, joe has been crying periodically and has had difficulty sleeping and eating. his behavior

For several days, joe has been crying periodically and has had difficulty sleeping and eating. his behavior would be difficult to categorize as normal or abnormal without knowing the cause of his behavior.

Cis the most source of vitamins

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b