Which one of the following first vascular plant
a.)bryophyta c.) angiosperm
b.)peridophyta. d.) gynosperm

Environmental impacts on evolution : mastery test

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.

Which environmental change would most likely result in bullfrog offspring that are able to store more water than bullfrogs in previous generations?