Which of these is a case of selective breeding?

1.) to increase the production of milk in a herd of milk cows, the highest producing cows were chosen as the mothers.

2.) over time, more milk cows at the diary farm began to produce larger amounts of milk.

3.) a gene was identified that increased milk production. this gene was added to calves in the womb.

4.) the genome of a group of cows was analyzed to identify the gene for milk production.

If you add 10ml of hot water to 10ml of cold water and the change in tempature 8°c calculate how much energy is gained by the cold water

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

How many atoms are there in 5.70 mol of mg