A type of feed claims to boost the growth rate of cows. The feed is tested on two twin newborn cows. Bessie receives the experimental feed and Bertha receives regular corn feed. Their weights are recorded below. **In pic.** What would be the independent variable?
age of the cow
type of feed
weight of the cows
type of cow
![A type of feed claims to boost the growth rate of cows The feed is tested on two twin newborn cows Bessie receives the experimental feed and Bertha receives reg class=](https://us-static.z-dn.net/files/d64/6ad66d96af4124aafd093f19f80bf5b5.jpg)