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Q How many germ layers originate the body of platyhelminthes? In relation to this characteristic how are these animals classified?
Platyhelminthes are the first triploblastic animals (remember that cnidarians are diploblastic) that is they present three germ layers: ectoderm, endoderm and mesoderm.
Biological Nitrogen-Fixation The process by which molecular nitrogen (N 2 ) is reduced to ammonia (NH 3 ) is called nitrogen-fixation (N 2 -fixation). This is the most importa
Categories of Secondary Inductions The secondary inductions are categorized into two types. 1) Instructive Interaction : In such type of an interaction the inducing tissue
What are the affinities of pteridophytes with gymnosperms?
Q. Prevention and Control of Staphylococcal food poisoning? Staphylococcal food poisoning can be prevented by: 1. Avoiding contamination of food with S. aureus. 2. Prev
Is the transportation of gases in tracheophytes made through the vascular tissues? The Carbon dioxide and The Oxygen are not transported through the xylem or phloem. These gase
Explain the Combating drug-resistant diseases? The growth of drug-resistant strains of disease-causing bacteria threatens the current effectiveness of cheap antibiotics. This i
Define Important Food Sources of Protein? The important sources of proteins in the diets of low-income groups are cereals and legumes. Meat, fish, eggs and milk are important s
According to the stimuli they collect how are the sensory receptors classified? The sensory receptors are divided according to the stimuli they get: mechanoreceptors are stimul
Q. Why is cannibalism an inharmonious intraspecific ecological interaction? In the cannibalism an individual eats other of the same species (occurs in some arachnids and insect
Define Interferons - Humoral Mechanisms Interferons are soluble proteins secreted naturally when cells become infected by foreign bodies. Infected lymphocytes release interfero
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