Why is it necessary for children to get more than one vaccination for a pathogen?

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity hurry!

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi