Fish amphibians reptiles, birds, and mammals have similar embryos They all start with gill slits Fish and some amphibians grow to have gills. Some amphibians, reptiles, birds, and mammals develop lungs to breathe air They all start with tails Fish, some amphibians, reptiles and birds grow tails Humans do not keep their tails. Fish and reptiles develop scales. Amphibians, birds, and humans have skin Birds have feathers, and humans have hair
Which two animals exhibit the most linear relationship?
A: amphibians and fish
B: amphibians and reptiles
C: birds and humans
D: birds and reptiles

a polar bond is formed when electrons are shared unevenly between atoms

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

yes the answer is total mass in unchanged   : )