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According to the theory of natural selection, what factor below contributed to the current variations in beak sizes of finch species on the Galapagos Islands? a. Finches dispersed to islands where their beak sizes closely matched available seed sizes b. Different finch populations needed to change in order to survive, so beneficial new traits arose c. Non-heritable variation between individual was important for natural selection to work d. Genetic drift allowed beneficial traits to spread throughout the population e. Seeds are limited resource.
Tracheal Gills - Respiration In many species of aquatic insects the air in the trachae is replenished by diffusion of oxygen via tracheal gills. Many aquatic insects carry a t
Tools of lower paieolithic age Pleistocene times there were huge herds of very large mammals. Bones of such large mammals were found associated with the human fossil finds and
(a)State the law of independent assortment. (b )Using punnett square demonstrate the law of independent assortment in a dihybrid cross including two heterozygous parents.
Explain the Ecosystems? The ecosystem is yet another level, or ecological unit, studied by ecologists. An ecosystem encompasses all of the organisms (all the populations-the en
State the the amount of the nutrient On increasing the amount of the nutrient the yield increases and the decrease from the maximum i.e., (A-y) becomes less. Subsequent additio
Habitat Conservation - Conservation of Wildlife Actually conservation means different things to different people. In the present context, conservation refers to the preservati
What are the physiological systems known as integrative systems? Why is this designation justified? The integrative systems are the nervous system and the endocrine system. The
Cnidaria - Protozoa The mature medusoid jellyfishes like Aurelia are the sexual stages. Sperms and eggs produced in the dissimilar (male and female) individuals ale released i
Human lungs A pair of spongy, elastic and bag like structures of lungs is present in the chest cavity, one on either side of the heart. Lungs are enclosed by a double lay
Name few genetic diseases
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