Question

which one of these would be considered an investigation? a measuring the ph of common household chemicals. b observing the effects of different track surfaces on the speed of a go - cart. c investigating the effects of different amounts of caffeine on heart rates of test subjects. d testing different amounts of fertilizer on tomato plants to find which causes the greatest growth.

Explanation:

All options involve a scientific - like process of observing and measuring variables to understand relationships. Measuring pH is a chemical investigation, observing track surface effects is a physics - related investigation, studying caffeine effects on heart rate is a biology/medicine - related investigation, and testing fertilizer on tomato plants is a biology - related investigation. All are considered investigations in the realm of natural science.

Answer:

A. Measuring the pH of common household chemicals., B. Observing the effects of different track surfaces on the speed of a go - cart., C. Investigating the effects of different amounts of caffeine on heart rates of test subjects., D. Testing different amounts of fertilizer on tomato plants to find which causes the greatest growth.