Number of neutrons.
Since the definition for isotopes is--Atoms of the same element having the same number of protons but different number of neutrons.
In 2Ba(OH)2...
Ba = 2
O = 4
H = 4
In the event of an earthquake, If you are in a car, pull over and stop. Set your parking brake. If you are in bed, turn face down and cover your head and neck with a pillow. If you are outdoors, stay outdoors away from buildings. If you are inside, stay and do not run outside and avoid doorways. Expect aftershocks to follow the main shock of an earthquake. Be ready to Drop, Cover, and Hold On if you feel an aftershock. If you are in a damaged building, go outside and quickly move away from the building. Do not enter damaged buildings. If you are trapped, send a text or bang on a pipe or wall. Cover your mouth with your shirt for protection and instead of shouting, use a whistle. If you are in an area that may experience tsunamis, go inland or to higher ground immediately after the shaking stops. Check yourself and others for injuries. Provide first aid for anyone who needs it. Check water, gas, and electric lines for damage. If any are damaged, shut off the valves. Check for the smell of gas. If you smell it, open all the windows and doors, leave immediately, and report it to the authorities (use someone else's phone).
Turn on the radio. Don't use the phone unless it's an emergency. Stay out of damaged buildings. Be careful around broken glass and debris. Wear boots or sturdy shoes to keep from cutting your feet.
Be careful of chimneys (they may fall on you).
Stay away from beaches. If you're at school or work, follow the emergency plan or the instructions of the person in charge.
The correct answer is Mitosis !! B !!
Mitosis did not do DNA varriations !!
