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Which terrestrial vertebrate group is extremely rare in deserts?
Amphibians are terrestrial vertebrates extremely rare in desert environments (although there are a some species adapted to this type of ecosystem). Amphibians are rare in deserts because they do not have a permeable skin and so they simply lose water by evaporation and desiccate. They also require an aquatic environment to reproduce, as their fecundation is external and their larva is water-dependent.
What are the main constituents of the earth's atmosphere in our time? The present atmosphere of the earth is constituted mostly of molecular nitrogen (N2) and molecular oxygen
what is the importance of lignin in xylem formation
In terms of western medicines, over 3000 antibiotics - including penicillin and tetracycline - are obtained from micro-organisms. Another product of micro-organisms i.e. cyclospori
Q What is the main source of energy for living beings on earth? The sun, center of our planetary system and star of the Milky Way galaxy (our galaxy), is the source of the ener
What is the meaning of Chelicifore? These feeding mouthparts are found on most, pycnogonads. Though the proboscis is the main feeding structure in these animals when chelicifor
What are the six criteria used to build a complete evolutionary branch of vertebrates? Dichotomy in each of the six following criteria builds the vertebrate evolutionary branch
Why are the recombinant DNA technology and the nucleus transplantation technology still dangerous? The recombinant DNA technology and the nucleus transplantation technology (cl
How to improve the Quality of Protein in the Diet? Since the net protein utilization (NPU) values of milk or egg proteins are higher than those of proteins of average diets con
Q. What is the kind of reproduction that occurs in roundworms? What usual feature do nematode sperm cells have? Nematodes reproduce sexually. The nematode sperm cell does not h
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