Vaccination has proven to be a highly effective weapon against certain diseases. –, which at its peak in the 1940s and 1950s infected – in the United States each year, has been – eradicated worldwide through vaccination. Newly developed vaccines against diseases such as – hold great promise as a public health tool in Africa.

Both in the Americas and worldwide, malaria is less of a problem than it once was. Place in chronological order the steps that were taken to fight it.

Explanation:

so we know the answer cannot be c because no insect or animal starts as an adult

the answer is a. a swimming larvae

because since they are sea animals they automatticaly have to know how to swim they cannot just sink to the bottom

sorry if this is the incorrect answer.

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