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Which type of cell came first in evolution - the eukaryotic cell or the prokaryotic cell?
This is an interesting problem of biological evolution. The most accepted hypothesis asserts that the simpler cell, the prokaryotic cell, appeared earlier in evolution than the more difficult eukaryotic cell. The endosymbiotic hypothesis, for instance, affirms that aerobic eukaryotic cells appeared from the mutualist ecological interaction among aerobic prokaryotes and primitive anaerobic eukaryotes.
Of which type of tissue is the heart made? How is this tissue oxygenated and nutrified? The heart is made of striated cardiac muscle tissue. The heart muscle is known as the my
STIMULENT S - It makes a person more wakeful, alert and active. (i) Caffeine ( C 8 H 10 N 4 O 2 ) - It is 1,3,7-trimethylxanthine obtained from tea leaves ( Thea si
Q. List the stages of process of behaviour change? Stages of behaviour change process: · Unawareness · Awareness · Acquiring knowledge · Motivation · Trial
Zoochory - Dispersal of Seeds Some fruits are eaten by animals and the seeds are passed out with the excreta (endozoochory). Plums, Lantana, grapes, figs and guava are example
It is the most common (occurring in 75 per cent cases of ARF) manifestation of ARF. It involves large joints, it is typically fleeting in character shifting from one large joint t
Explain Problems of Infants and Preschoolers Nutrition? In spite of all nutrition interventions, there are some of the common yet life threatening problems which need to be loo
Q. What are the main chemical compounds that destroy the ozone layer? The major chemical compounds that destroy the ozone layer are the CFCs, chlorofluorocarbons, or freons, su
what are four types of microorganisms and their definitions?
Q What is the kind of nitrogen waste that mammals eliminate? Like chondrichtian fishes and adult amphibians, mammals are ureotelic that is they excrete urea. Q. How do plac
What is the role of radiographic evaluation in implant treatment? Radiographic examination is very different with implants than with teeth. Radiographs are frequently used in i
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