Answer:
A
Explanation:
by the definition of natural selection more fit organisms survive and reproduce more, propelling population change.
A) They permit digestive end-products to make
contact with body cells.
B) They permit exchange between the external
atmosphere and the circulatory system.
C) They transport gaseous cellular wastes from
body cells to the lungs for excretion.
D) They regulate the amount of ammonia and salt
dissolved in body fluids.
The function of the respiratory passageways in humans is to permit the exchange of gases, mainly oxygen and carbon dioxide, between the body and the external environment through the process of respiration.
The main function of the human respiratory passageways is primarily to permit the exchange of gaseous substances, namely oxygen and carbon dioxide, between the body and the external atmosphere. This is achieved through a process called respiration.
When we breathe in, oxygen from the air gets filtered and warmed in the respiratory passageways and reaches our lungs. It then gets transferred to the bloodstream. On the other hand, the carbon dioxide, a gaseous waste product of our body cells, moves from the bloodstream to the lungs, gets expelled through the respiratory passageways when we breathe out.
It's worth mentioning that the other options such as allowing digestive end-products to touch body cells or regulating the amount of ammonia and salt in body fluids are not direct functions of the respiratory passageways.
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Answer:
Delta fibers.
Explanation:
Myelinated fibers may be defied as the fibers that are covered by the myelin sheath. Three different classes of nerve fibers are group A nerve fibers, B fibers and C fibers.
Delta fibers are the type of group A fibers. These fibers are involved in the transmission of the acute pain information. The information is transferred from the sensory fibers to the central nervous system. These delta fibers can carry information faster and they are larger than the C fibers.
Thus, the correct answer is delta fibers.
The answer is:
fungi are either saprophytes or parasites
Answer:
Archaebacteria, Eubacteria, Protista, Fungi, Plantae, Animalia.
Explanation:
According to biological classification system, there are six different kingdoms, in which organisms are classified according to their common characteristics.
Kingdom Eubacateria includes unicellular, prokaryotic organisms. These organisms lack true nucleus and other complex cell organelles. Examples: bacteria and archaea.
Kingdom Protista includes unicellular (mainly), eukaryotic organisms having true nucleus and other membrane-bound organelles. Protists may be autotrophic or heterotrophic. Amoeba and paramecium are examples of protists.
Kingdom Fungi include eukaryotic, multicellular (yeast is an unicellular fungus) organisms. They are heterotrophic organisms that depend on other organisms for food. Examples: mushrooms and aspergillus.
Kingdom Plantae includes multicellular, eukaryotic, autotrophic organisms. They contain chlorophyll molecules that help in photosynthesis and make their own food. Examples: all green plants.
Kingdom Animalia include all multicellular, eukaryotic animals that reproduce only via sexual reproduction. They are heterotrophic organisms and depend upon other organisms for food. Examples: humans, insects, and fishes.