causation

"The patient followed the doctor's instructions carefully. "

"My teacher explained the new math concept, and I understood it perfectly. "

"The teacher determined the rules for the classroom project, setting clear limits on the length of presentations. "

"The factory produced 1000 cars last week. "

"I need to study my biology notes."

"Scientists study plants to understand how they grow. "

"to investigate the causes of natural phenomena"

"He still has nightmares resulting from the treatment he received from his captors."

"The spreads on the sandwiches at the picnic included peanut butter and jelly. "

"The tomato plants had some kind of disease that left their leaves splotchy and fruit withered."

"The lightning caused thunder."

"The causality between eating junk food and feeling tired is well-established; the food's lack of nutrients causes a drop in energy levels. "