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Why is it more probable that the photosynthetic prokaryotes appeared before the aerobic eukaryotes?
It is more feasible that photosynthetic prokaryotes appeared before the aerobic eukaryotes because without photosynthesis the earth's atmosphere would not be enriched with molecular oxygen, and without oxygen the existence of aerobic beings would not be possible.
Gastrointestinal Hormones The three main mammalian gastrointestinal hormones are secretin, gastrin and cholecystokinin (CCK). There are several other hormones all peptides. Th
Closed Type of Circulatory Systems Some non-chordates, like cephalopods (octopuses, squids), earthworms, polychactes and all vertebrates have a closed circulation along with b
Proestrus - Estrous cycle This precedes the next heat and is characterised by functional involution of the corpora lutea and preovulatory swelling of the follicles. Fluid coll
Define the Structure of D and L isomerism? The prefix D or L are used to refer to the configuration of the carbon next to the primary alcoholic group or in other words, the con
Asexual Reproduction - Its Prevalence and Significance Having studied the several aspects of asexual reproduction in the non-chordates we can now make a few generalizations.
Q. What is circulation? Circulation is the movement of substances like gases within blood vessels and nutrients and cavities throughout the organism. Q. Do all animals have
If a codon is CDC, what proportion of nucleotide changes in the third position result in a new amino acid? If the codon is AGG, what proportion of changes in the first position res
Systems of Human Body Many organs work in a coordinated'manner to form a system. For example in our-body the nose, the trachea and the lungs form the respiratory system. Table
On a separate piece of paper, draw a simple family tree for a couple showing children (F1), and lineages from two children showing grand children (G2), great grandchildren (G3), gr
What are examples of the ecological and economic importance of molluscs? Molluscs are significant players in several food chains in ecosystems. Many marine molluscs are part of
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