Which important event occurs in the second trimester? (1 point) The developing human can begin to move its arms and legs.
The face of the developing human starts to form.
The heartbeat of the developing human can be heard via stethoscope.
The developing human starts responding to sounds.

This is so important ugh its 25 points

What substance acts to prevent sudden ph changes in bodily fluids?

The image shows the evolution of a species of fish. a few fish from a population developed different social behaviors and evolved into different species. two fish according to the image, the fish underwent . the new species of fish had mating seasons that were different from that of the original fish. because of the differences in mating seasons, the fish underwent reproductive isolation. this mode of isolation would be .