Which term refers to the evolutionary history of a species

a. phylogeny

b. classification

c. taxon

d. taxonomy

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

If anyone who can me with this hw? i would really appreciate it

What is the gravitational attraction between a dating couple whose centers of mass are 0.630 m apart if the boy weighs 715 n and the girl weighs 465 n?