1. How long does it usually take to develop a vaccine? 2. From the text, define immunity.

3. From the text, what is a placebo?

4. About how many Americans were polled and said they would not take the vaccine if it were available now?

5. What 3 main things can we do NOW to protect ourselves and our loved ones?

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Explanation:

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.