What is an easy way to distinguish dietary supplements from foods and over-the-counter drugs?​

Which of the following correctly list the first appearance of organism in the fossil record from earliest to most recent

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed

What class of levers is shown in this image?