Question

genetic factors and growth quick check
ruby has observed that plants in her garden vary in height. she wants to investigate whether a plant species (species a) grows faster than the other garden species (species b, c, and d). select the statement that describes ruby gathering enough evidence to support a scientific explanation concerning plant growth rates.
note: consider reviewing how ruby developed her conclusion on page 8 of this lesson to select the best answer.
(1 point)
ruby measures the heights of several species a, b, c, and d plants, each species for one week at a time for four consecutive weeks.
ruby measures the heights of several species a, b, c, and d plants for a week under the same conditions and finds journal articles that describe the growth rates of each species.
ruby measures the height of a species a plant for a week and finds an anonymous gardening blog that describes the growth rate of species a.
ruby measures the heights of several species a, b, c, and d plants for a week under different conditions and finds a journal article that describes the growth rate of species a.

Explanation:

To gather enough evidence to support a scientific explanation, Ruby needs to have multiple data points (several plants of each species) measured over time (four consecutive weeks) under the same conditions. This provides a comprehensive dataset for comparison. Measuring for only one week (as in some options) or under different conditions (which introduces confounding variables) or relying on a single - plant measurement and an anonymous blog (which may not be reliable) is insufficient.

Answer:

Ruby measures the heights of several species A, B, C, and D plants, each species for one week at a time for four consecutive weeks.