What is an agent that can cause infections and diseases

What are 3 things I can expect from biology and my biology teacher. (I don't know a lot about biology)

What is the relationship between the liver and the gallbladder

To conserve forests we should ban cutting down of trees completely?

The food web will suffer a lot. Because of the disease animals and humans will die which in turn will destroy the web. If animals die, humans will not be able to acquire animal food.

Label the sequence of events for the evolution of the atmosphere in the correct order

Definition of antigens

Which of the following decreases the reliability of results from a clinical trial? A. An obsolete medical treatment B. A double-blind technique C. A short observation period D. A voluntary enrollment plan

How quickly can a cheetah, running 27 meters per second, reach a zebra approximately 108 meters ahead of it (assuming the zebra does not run away)

Describe relationship between observation and scientific theory

What effect do calcium ions have on the water in ecosystems? A. They reduce its pH. B. They decrease its salinity. C. They add to its hardness. D. They increase its acidity.