Answer:
The respiratory system is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies greatly, depending on the size of the organism, the environment in which it lives and its evolutionary history. In land animals the respiratory surface is internalized as linings of the lungs. Gas exchange in the lungs occurs in millions of small air sacs called alveoli in mammals and reptiles, but atria in birds. These microscopic air sacs have a very rich blood supply, thus bringing the air into close contact with the blood. These air sacs communicate with the external environment via a system of airways, or hollow tubes, of which the largest is the trachea, which branches in the middle of the chest into the two main bronchi. These enter the lungs where they branch into progressively narrower secondary and tertiary bronchi that branch into numerous smaller tubes, the bronchioles. In birds the bronchioles are termed parabronchi. It is the bronchioles, or parabronchi that generally open into the microscopic alveoli in mammals and atria in birds. Air has to be pumped from the environment into the alveoli or atria by the process of breathing which involves the muscles of respiration.
Explanation:
The DNA has to replicate before mitosis to keep the number of chromosomes consistent. Hope this helps.
Answer: cellular respiration
Explanation: I hope this helps
C) Crops may cause an increase of allergic reactions in humans.
<span>The answer is D. Both fungi and plants can
grow in soil.</span>
<span>
Through the process of elimination:
- Plants are autotrophic organisms while fungi are heterotrophic organisms.
- Plants have vascular tissue, and fungi don't.
- Fungi are the only organisms that have cell walls made of chitin.
Therefore, the correct choice is that both fungi and plants can grow in soil.</span>
