Louis Pasteur made several major contributions to microscopy. Which was a discovery or invention made by someone other than Pasteur? 1. He was the first to view a bacterium.

2. He proved microorganisms cause fermentation and disease.

3. He developed a process to make cow’s milk safe to drink.

4. He created vaccines against rabies and anthrax.

Which layer will become saturated first when rain falls?

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

Select the word from the list that best fits the definition a system made of 25 satellites