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Define Class – Arachnida?The class Arachnida (Arachnida = spider) has terrestrial and few aquatic animals. It includes spider, scorpions and mites.1. Prosoma bears. six pair of appendages: one pair of clielicerae, one pair of pedipalpi and four pairs of walking legs. 2. Abdomen is generally devoid of appendages. 3. Respiratory organs are tracheae, book lungs and book gills. 4. Excretion is performed by malpighian tubules and coxal glands. 5. Sexes are separate but sexual dimorphism is not conspicuous.So, you have refreshed your background knowledge of1.he characters of subphylum Chelicerata and class Arachnida. Let us now study individuals examples under the class Arachnida.
Congenital Aortic Stenosis : The valve may be unicuspid, bicuspid or tricuspid. Rarely it is a dome shaped diaphragm. Uni commissural aortic stenosis produces significant sy
X-ray Chest It is helpful in assessing heart size. One should look for presence of pericarditis, pulmonary oedema or pulmonary congestion. ECG One should look for pro
a) What does secondary productivity in an ecosystem indicate? b) List any two factors by which productivity is limited in aquatic ecosystems
Q. Compared to platyhelminthes which physiological problems have the cylindrical body of nematodes brought? How was that problem solved? The cylindrical shape of nematodes made
Human Impact on Carbon Cycle Human activities have greatly influenced the carbon cycle. The discharge of CO 2 , into the atmosphere is steadily increasing owing to burning of
What are the symptoms and foods associated with campylobacteriosis? Campylobacteriosis incubation period: 2-5 days after ingestion of contaminated food. Symptoms: Diarrhoe
what is condom???
#question.what is protostomous and deuterostomes development.
why they are called protozoa
The protein truncation test (ptt) gives an uncommon exception, targeting mutations that create shortened proteins, majorly premature translation termination. Ptt has various attrac
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