reproduce both asexually and sexually during its life cycle Polyps reproduce asexually by budding Produces genetically identical offspring Medusa form reproduces sexually releasing gametes into the water Fertilized egg develops into free-swimming larva called a planula Planula develops into polyp stage Cnidarian Anatomy Cnidarian bodies have 2 tissue layers separated by a non-cellular jelly – like material called mesoglea Outer tissue layer is made up of 3 types of cells: 1. Contracting cells 2
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We can’t survive without bees Introduction Honeybees‚ which are responsible for pollinating most of the foods we eat‚ like honey‚ oil and fruits. However‚ large amounts of honeybees are disappearing in recent years. According to survey‚ scientists found different viruses in dead bees‚ the guts of bees appeared pathological changes as well. This phenomenon indicates that their immune system once tried to form strong immunity‚ but they failed. From the perspective of spiritual ecology‚ five
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habitats. They mainly grow in oak savanna and pine barren plant communities. Lupines in shaded habitats may survive‚ but usually with poor vigor and without flowering. Eventually the lupines will die‚ also causing the Blue Karner Butterflies to die. The larva of the butterfly crawl up the lupine stems and eat the new leafs. The active periods for both the butterfly and lupine is 4 months. Fire suppression has consistently been identified as the primary factor for
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space. Drosophila melanogaster has a life cycle of four specific stages. The first stage is the egg‚ which is about . 5mm long. In the 24 hours when the fly is in the egg stage‚ numerous cleavage nuclei form. Next‚ the egg hatches to reveal the larva. During this stage‚ growth and molting occur. Once growth is complete‚ the Drosophila enter the pupal stage‚ where it develops into an adult through metamorphosis. Upon reaching adulthood‚ the flies are ready to mate and produce the next generation
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photo-thermal controlled tanks‚ implanted with HCG or Ovaplant‚ and successfully spawned fish during the natural spawning season Newly Hatched Larva 2003: Larval rearing trials with the eggs spawned in captivity resulted in the production of 78‚900 larvae at 3 DAH and 4‚780 45-day-old juvenile pompano Pompano Larval Growth (2-45DAH) 70 9-day old Larva LengthTL(mm) 60 50 40 30 20 DAH vs Mean 10 0 0 10 20 30 40 50 Age (DAH) 2003: Fingerling trials were conducted to look at the
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pathway share an interesting relationship. It is already known that IGF-1/Insulin signaling pathway promotes reproductive growth and survival. It was found in C. elegans that insulin/IGF-1 signaling pathway cause the nematodes to enter the ‘dauer larva’ stage because of lack of nutrition and other factors; and‚ resulted in altered tissue aging from mutations in the IGF pathway‚ as well. Another interesting concept of the IGF pathway concerning autophagy is that the TOR signaling pathway interacts
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The Road to North America Bull thistle is native to Europe‚ Asia and Africa. But can be found on all continents except Antarctica. There are many speculations on when it made its way to North America but it is thought to have made its way to Eastern North America in the Colonial times. It started showing up in the Western part is the late 1800’s or early 1900’s. It is considered a noxious weed because it may outcompete the native plants to that area. Causing the native plants to cease to exist
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The fruit fly Drosophila melanogaster are an excellent specimen for research in genetics. Many reasons are that they have a rapid reproduction rate‚ easy to care compared other animals and less expensive. Researchers have determined the nucleotide sequence of nearly the entire 120 megabase euchromatic portion of the Drosophila genome (Cite). Drosophila has a simple genetic arrangement of only four chromosomes which contains three autosomes and one sex chromosome according to(--) and because of this
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startling facts. A person who eats animals will consume 100+ animals per year. More than 10 billion animals are bred and slaughtered for food every year in the U.S. alone. One cubic inch of Grade A beef often has over 1‚000 parasite larva in it. In the U.S.‚ we have the highest permitted upper limit of milk pus cell concentration in the world. That is almost twice the international standard of allowable pus cells. Fish grow underwater “gardens”. They use their
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Chapter 7: Living in the Environment: environmental factors and their influence Questions Introduction 1. Why is a Polar bear found living in a cold icy place and a fish found living in water‚ but not in other environments? Because it is their habitat in which they are adapted to. It has certain adaptations to allow it to survive in that environment and resources are available in the environment. 2. Give the definitions for the following words (the glossary at the back of the book may help
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