1.Describe the basic process of metamorphosis and give three examples from three different phyla of the...

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Biology

1.Describe the basic process of metamorphosis and givethree examples from three different phyla of the varied forms ofmetamorphosis in the animal kingdom.
2.Animals typically show either radial or bilateralsymmetry. Explain what this means and discuss how this affectstheir ecology and behavior.
3.Only a few groups of animals have conquered landthroughout evolutionary history. Identify these groups and describesome of the challenges associated with life on land as opposed tolife in water. Given the challenges, what advantages are there toliving on land?
4.With over one million species described, arthropodsare the most diverse group of animals. In the space below, brieflydescribe at least three reasons that make arthropods such asuccessful group of animals.

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1 Metamorphosis is the transition in overall body pattern that occurs during the life history of some animals following birth or hatching In general cells in the different parts of a multicellular organism all have the same genes although only some of these genes are expressed translated into proteins in any given cell At the molecular level highly regulated temporal and spatial changes in gene expression cause metamorphosis in all animals Metamorphosis is iodothyronineinduced and an ancestral feature of all chordates Insects metamorphosis insects are classified as Ametabola Hemimetabola or Holometabola The Ametabola do not undergo metamorphosis During development these insects increase in size but do not undergo distinct changes in form In general the Ametabola do not have wings both hemimetabolous and holometabolous insects have significant morphological and behavioral differences between larval and adult formsIn the Hemimetabola a form called the nymph hatches from the egg Nymphs lack wings but have compound eyes and otherwise resemble the adult form except they are smaller In Holometabola the larva develops into a pupa inside a cocoon The pupa is often considered a resting stage and can often survive in unfavorable environments Eventually the pupa metamorphoses into an adult Amphibians Metamorphosis differs in the many different amphibian species In frog development the eggs hatch and give rise to tadpoles small aquatic larvae that have external gills and are mainly vegetarian As the tadpole grows internal gills and limbs form Several significant changes occur during metamorphosis into the adult including the growth of largemouth and tongue loss of gills the formation of lungs growth of the front legs and resorption of the tail Numerous See Answer

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