Which of the following body systems do both roundworms and flatworms lack? a.circulatory b.digestive c.nervous d.none of the above
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Ответ:
the correct answer is option A.
Explanation:
Roundworms and flatworms cells are close to the animal's outer surface which help them absorbtion. Both roundworm and flatworm use diffusion to respire and for circulation of substances around their body.
They lack circular muscles so only way to undulate is from side to side. They does not need to circulate oxygen they simply diffuse it from skin.
Thus, the correct answer is option A.
Ответ:
The non-specific immune system involves defenses that are general and ongoing. Skin, parts of the lungs, and stomach are mechanical barriers. After the pathogen enters the body, non-specific cells like macrophages attack and ingest the pathogens, and natural killer T-cells attack the pathogen directly.
Explanation: Examples - Barriers. One way for an organism to defend itself against invasion is through barriers that separate the organism from its environment. ...
Proteins. ...
Cellular Defenses. ...
Inflammation. ...
Fever. ...
Bibliography.