Three structures shared by every chordate which typify group
Write down the three structures shared by every chordate which typify the group?
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All beings of phylum Chordata encompass branchial clefts in pharynx (in some species present only in embryo), notochord (substituted through spinal column in vertebrates) and dorsal neural tube.
Oxygen comes from the environment and carbon dioxide in the end returns to the environment. How small animals do solve the problem of taking away and bringing these molecules from/to their cells? Why isn't that solution possible for the larger animals?
Explain how do the muscles of legs and of feet contribute to the venous return?
What is the basic difference among natural and essential amino acids?
Name cells with a delimited nucleus? Describe the major elements of the nucleus?
Why are vaccines made of own disease agent or of the fragments of it?
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Why do plants require exchanging the gases with the environment?
Specify the plant tissues which cover the stem and the leaves?
Give a brief explanation of community. And also write down differentiation between the concepts of community and population.
Explain the normal sign of an electric charge among the two sides of neuron plasma membrane? Describe the potential difference (or voltage) produced between such two sides? What is that voltage termed?
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