Answer:
This phenomenon is known as <u>Exaptation</u>.
Explanation:
This phenomenon occurs in both anatomy and behavior and serves to provide an advantage to the organism or specie that undergoes exaptation. It is a process that can be considered as an opposite to adaptation.
Hope that answers the question, have a great day!
Answer:
A.true
B.false
Explanation:
A. lymphocytes or bcells produce antibodies involved in humoral immunity
B. innate immune system is sustained long by innate immune cells
Answer:
D. on the surface, directly above the focus
Answer:
The correct answer will be option-C
Explanation:
The rhythm of the heartbeat is controlled by the pacemaker of the heart called the sino-atrial node.
The SA node generates action potentials which trigger the contraction and relaxation of the atrium and ventricles. The membrane potential generation initiates by the depolarization of the cell membrane when the L type of Ca⁺² ions opens up and calcium ions enter the cell.
This depolarizes the cell until the potential threshold is reached which lies between the -40 and -30 mV.
Thus, Option-C is the correct answer.
They are oxygen, carbon, hydrogen, and nitrogen.
