What are the neutrons for HE and K

Embryos of different species look very similar, which shows that the organisms share a ancestor.

How would you reduce the volume of gas

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here