Answer: (B) Pre-zygotic; post-zygotic.
Explanation:
Prezygotic isolation occurs before fertilization of eggs. It occurs between the two sex gametes and deter sexual reproduction between different species.
However, individuals are considered to be diverge on the phylogeny tree and different species, when they cannot reproduce.
Mechanisms of prezygotic isolation include habitat isolation, gamete isolation, mechanical isolation, behavioral isolation, and mating seasons.
Whereas, postzygotic isolation prevents the formation of fertile offspring. This phenomenon leads to production of an hybrid offspring from different species and this is a form of speciation in nature.
Mechanisms of postzygotic isolation include hybrid inviability, hybrid breakdown, and hybrid sterility.
For me your question is blank.
The answer is B (<span>fish and amphibian) :)</span>
Answer:
The correct answer is A, as the statement is true. The enzyme catchol-o-methyl transferase (COMT) in the nervous system is important in the degradation of catecholamines by neuroglia cells.
Explanation:
Catechol-O-methyltransferase, abbreviated as COMT, is one of several enzymes in the body involved in the degradation of catecholamines such as dopamine, norepinephrine and adrenaline. The enzyme works by transferring a methyl group to the signal substance from the SAM donor group (S-adenosylmethionine).
Aerobic respiration is far more energy-efficient than anaerobic respiration. Aerobic processes produce up to 38 ATP per glucose. Anaerobic processes yield only 2 ATP per glucose.
