Which is a similarity between a fish embryo and a bird embryo in the early stages of development? Gill slits
forelimbs
jaw bones
hind limbs

Equal volumes of h2 and o2 are placed in a balloon and then ignited. assuming that the reaction goes to completion, which gas will remain in excess? 2h2 + o2 → 2h2o a. both are in equal proportion b. oxygen c. water d. hydrogen