A protostar forms once the nebular cloud condenses and the core begins to heat. To heat is the answer hope this helps you!!
It’s the last one - it is breathed out
velocity is a vector so it has a magnitude and direction so the answer would be B
Mountain lions with lots of variation because variation is important for species’ survival. If there is an environmental change that negatively affects organisms with a certain trait, variation can insure that the entire species will not be wiped out because some organisms within that species might not have that trait and can survive.
The answer is B.The respiratory system supplies the oxygen that the cardiovascular system transports to the different cells for the production of energy.
