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subphylum trilobitomorphasubphylum trilobitomorpha involves the trilobites all species are extinct and the fossils point out that they were all
characteristic features of phylum arthropoda well-developed muscular system along with striated muscles attached to the exoskeleton and visceral
phylum arthropoda - classification of multicellular animalsearlier you known how the coelom evolved and the body of the coelomates got segmented
class hirudinea - classification of coelomthese are leeches number of body segments of these types of animals is fixed usually there are 34 segments
class polychaeta - classification of coelomthere are mainly marine forms with distinct head having eyes and tentacles segments have lateral
characteristic features of coelom sensory system consisting of eyes photoreceptor cells statocysts taste buds and tactile organs respiration by skin
metamerism oe segmentation in the early coelomates the coelom was not divided into segments the whole body cavity was a single space hence body
classification of multicellular animals - coelom we know earlier that the pseudocoel gave animals specific selective benefits among other things this
defects in human development1 for instance when a pregnant woman drinks alcohol her embryo is exposed to similar concentration of alcohol as is in
flaws in developmen of human the human growth and development in spite of its complexity works perfectly most of the time but while development goes
placenta - human developmentwe had said previous in the unit that in the second week of development a primitive uteroplacental circulation is
extra-embryonic membranes and placenta the extra embryonic membranes like you already know provide nourishment and protection these membranes are
embryonic development the embryonic stage extends from the second week by the 8th week and is charactrised by formation of placenta the development
implantation - pre-embryonic developmentafter entering the uterus and formation of icm the blastocyst starts to embed in the endometrium of the
pre-embryo - human developmentabout thirty hours after fertilization the zygote goes through mitosis giving rise to 2 blastomeres these blastomeres
vitro fertilization - human developmentin case a woman cannot conceive due to her uterine tubes are blocked she can become pregnant by means of in
fertilization - pre-embryonic developmentovulation generally takes place between 9th to 14th day after the end of last menstrual period fertilization
pre-embryonic development we had said in the starting of the unit that prenatal development can be divided into two phases embryonic and foetal the
respiratory system - developmental changes after birththe new-borns lungs are collapsed and need powerful breaths to inflate them airways too are
spermatogenesis - gametogenesisthe procedure of maturation of spermatogonia into sperms starts at puberty about 14 years and continues into old age
gametogenesis - human developmentgametogenesis as you are responsive is the process of formation and development of specialized reproductive cells
human developmenthuman development is a continuous procedure that begins when the ovum from a female is fertilised via sperm from a male to form the
multicausal nature of cancer with several dividing cells in the organism and the various proto-oncogenes and tumor suppressor genes that can be
tumor suppressor genes tumor suppressor genes or anti-oncogenes generally inhibit cell division in cooperation with proto-oncogenes the very
proto-oncogenes proto-oncogenes are common genes present in all organisms and emerge to be highly conserved in the course of evolution they have been