Dr. Bloom wanted to learn if ice cream preferences were different at different ages. For her study, she conducted a one-time assessment in which she asked a group of 5 year olds, a group of 15 year olds, and a group of 30 year olds to identify their ice cream preferences. Dr. Bloom conducted a:

cross-sectional study

Explanation:

As per the medical science, a cross-sectional study (often recognized as cross - sectional research or cross-sectional test, regular conditions) is a form of experimental research that analyses data from a particular sample or a particular subset at a given time period — that's also, existing information. Thus, from the above we can conclude that the Dr. bloom conducted cross sectional study.

[content deleted] - user123802726recklesschicken

so you know what happened be fore you were alive

explanation: