Which of the following is an example of variations being favorable? Rabbits that was berries will likely starve in a drought

Worms that are diurnal are more likely to be eaten

Polar bears with longer coats will stay warmer in the winter

Ostriches have around 10 eggs per flock

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt