5 instruments used to test our wellness​

What are your thoughts on nonhuman trials? do you feel that testing should be done on animals? what are the advantages and disadvantages with nonhuman trails?

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

What angle should your knees not bend past when squatting? a. 30 degrees b. 45 degrees c. 90 degrees d. 120 degrees