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Natural selection is such a powerful force in evolution because cells with even a small growth advantage quickly outgrow their competitors. To illustrate this process, consider a b
What is the type of circulatory system present in arthropods? Do these animals have heart and respiratory pigments? In arthropods the respiratory system is open (lacunar). Blo
Q. Compared to mammals do birds absorb more or less water in their digestive system? Why is this phenomenon an adaptation to flight? Bird feces are more liquid than mammal a fe
Q. What is an example of positive feedback of the homeostatic regulation? In positive feedback the effect caused by an action stimulates the action even more. This is a rarer m
Draw a section of the microscopic structure of human retina and label any six parts in it. a) Name the structure that determines the eye colour in humans. What is the normal f
How dissimilar are intracellular and extracellular digestion? What is the evolutionary benefit of extracellular digestion? Intracellular digestion is that in which the breaking
Why is it significant that exact copies of DNA are produced during replication? Producing exact copies make sure that when a cell divides, the offspring cells will receive the
Variability refers to the differences in heritable traits exhibited by the individuals of a species. One of the major contributions of Darwin to the study of evolution was his book
experiments that support pressure flow as a mechanism for translocation
Hirschsprungs Disease (Congenital Megacolon): This is also known as congenital megacolon. There is absence of ganglion cells, submucus plexus and intramural plexus (parasym
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