Pharyngeal arches are organs that only invertebrate chordates have. The only invertebrate chordate among these options is C. sea star, also known as starfish, so I would say that is the organism that develops breathing organs from pharyngeal arches.
1) Birthrate. Because you need to accommodate for all the little humans on earth, whether that be housing or taxes and such. Plus we don’t want overcrowding in certain areas.
2) death rate. It’s important to look at the death rate of a population because it can show the condition quality of certain areas. If a place has a higher death rate or the rate increases too quickly, then that should signal that something is wrong.
Answer:
in the wall of the right atrium of the heart.
Explanation:
The sinoatrial node (SA), consisting of spindle-shaped cells, initiates the electrical activity of the heart. From its location in the right atrium in proximity to the superior vena cava, the electrical activity spreads to the atria, whose cells are larger than those of the SA.
Answer:
Uneven land surfaces created by limestone mining can cause transportation problems in the location. Which of these is the best plan to solve this problem? A.water the mining area regularly B.reduce th ...?"