Which is a compound? water iodine air calcium

How does a gymnosperm prevent itself from pollinating the same tree

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.

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2