Observation the action or process of observing something or someone carefully or in order to gain information:
Answer:
notochord, a dorsal hollow nerve cord and pharyngeal slits.
Answer:
Originally, the distinction was based on morphological differences. However, it soon became that some types of organisms had different forms at various stages in their lives, here is why
Explanation:
changed genes is passed on to the next generation. Most mutations are bad, but some of them make the organism more successful in its life. Organisms that inherit that favorable new gene are likely to become more abundant than others of the species. (geologic times)
Answer:
P waves are compressional which means they move through a solid or liquid by pushing or pulling similar to the way the sound travels through air, the particles of the material a P wave pushes through moves in the direction of the P waves energy, this is called the direction of wave propagation
Approximately twenty-five elements occur naturally on earth. Remaining elements either have to be synthesized or obtained through chemical reactions.
