The Zika virus present in a pregnant mother may lead to an infant born with microcephaly. Not all mothers who are infected with the Zika virus will have babies with Microcephaly but it does increase their risk. Using a deterministic model of causality (page 133) what type of cause is the Zika virus with regard to microcephaly?

Hint: X=Zika virus; Y=microcephaly

a) Necessary and sufficient
b) Sufficient but not necessary
c) Necessary but not sufficient
d) Neither necessary nor sufficient

Bonnie and bobby are saving money for a vacation. each friend starts with an amount and also saves a specific amount each week. bonnie created a table to show the total she has saved at the end of each week.. weeks 0 1 2 3 4 5 6 7 8 amount saved 12 16 20 24 28 32 36 40 44 bobby came up with the following equation to show the total, y, he has saved at the end of each week, x. y = 12x + 4 compare the rate at which each friend saves money. select the correct answer from the drop-down menu to complete the statement. the rate at which bobby is adding to his savings each week is $ more than the rate at which bonnie is adding to her savings each week.