Around age 40, adults see a decline in sexual functioning may need to wear bifocal lenses experience a sharpening of the senses experience a noticeable decline in hearing do not experience any physical changes

The response is the basis for vaccination. primary secondary tertiary none of the above

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.

What changes the stability of the element