The graph gives the number of varicella (chicken pox) cases between 1972 and 2011. varicella is an infectious disease caused by a virus. the disease causes rash, itching, and fever in patients. the varicella vaccine was introduced in 1995. what can you conclude about the vaccine?
a graph giving the number of varicella cases in the united states between 1972 and 2011; the varicella vaccine was introduced in 1995; graph shows a high in 1985 of 225,000 cases and a low in 2011 of about 10,000 cases
a.
it was successful in eradicating chicken pox from the united states.
b.
it had no effect on the rate of chicken pox cases in the united states.
c.
it caused a 10% decrease in the number of chicken pox cases in the united states from 1995 to 2011.
d.
it initially caused a large drop in chicken pox cases in the united states, and the rate continues to decrease.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

girl imma just put my comment here because i need a couple point okurrttt