Is this statement true or false?

A hypothesis is a lucky guess.

Many organs are involved in the processes of keeping the blood and the body clean. when poisonous or harmful substances are in the blood, they are absorbed by the and released in a less harmful form. when wastes are present in the blood, they are filtered out and removed from the body by the

Which of the following is a macronutrient? carbohydrates lipids amino acids all of the above

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?