Which of the following types of research is conducted on multiple occasions over time? a. experimental b. longitudinal c. representative d. cross-sectional

Correct answer choice is :

A longitudinal study is an analysis plan that includes repeated observations of the same variables over the short or long duration of time. It is often a type of observational study, although they can also be structured as longitudinal randomized practices.

the aorta is the large artery leaving the heart branches into smaller arteries, which eventually branch into capillaries.the arteries carry oxygen and nutrients away from your heart, to your body's tissues. the capillaries are small, thin blood vessels that connect the arteries and the veins. the statement that arteries carry oxygen-rich blood to capillaries is true. veins on the other hand are blood vessels that take oxygen-poor blood back to the heart.