What are the components needed in order for an experiment to be valid? identify these components in the following experiment: a scientist is testing a new plant food to see if it causes plants to grow faster. the scientist tests two plants with the new plant food, and two plants he grows without plant food

The scientist tests two plants with the new plant food, and two plants he grows without plant food.

Explanation:

A control is a sample which is kept constant in an experiment. It is kept as a benchmark for comparison with the test variables to observe the changes in the test variables. The use of control in an experiment is valid as it helps in determining the effect of one variable over the other or if the sample is not treated with any variable.

The scientist tests two plants with the new plant food, and two plants he grows without plant food. is the correct option. It is valid as in this two control samples are kept like two plants which grows without plant food used to compare with those who receive the plant food. Thus it will highlight the effect of plant food on growth.

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u