Betty learned about embryology in her science class. at home, her brother nathan noticed the human embryo and the fish embryo in her science notebook. he remarked that the embryos looked the same . how can this be true
( multiple choice )

How air particles exert a pressure on the inside of the balloon

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

How many liters of ethylene glycol antifreeze (c2h6o2), with a density of 1.100 g/l, would you add to your car radiator containing 15.0 kg of water if you needed to protect your engine to - 21.5°c? for water, kf = 1.86°c m -1.