1 )http://www.mbgnet.net/salt/animals/echinod.htm How Do Sea Stars Move? Each sea star had hundreds of tiny feet on the bottom of each ray. These are tube feet‚ or podia. These tiny feet can be filled with sea water. The vascular system of the sea star is also filled with sea water. By moving water from the vascular system into the tiny feet‚ the sea star can make a foot move by expanding it. This is how sea stars move around. Muscles within the feet are used to retract them. Each ray of a
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contain oleic acid as a primary component. -Some pheromones trigger aggregation between organisms‚ others can trigger separation. -Necromones trigger necrophoric (organisms remove their dead) or necrophobic (organisms avoid their dead) behavior. -Arthropods use pheromones‚ this includes sowbugs and cockroaches. Chemical signals are picked up by antennae. II. Hypothesis: When given a choice between two identical shelters‚ sowbugs will display necrophobic behavior by aggregating in the shelter that
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1 Copyright © 2011 Pearson Education‚ Inc. Campbell’s Biology‚ 9e (Reece et al.) Chapter 32 An Overview of Animal Diversity About 40% of the questions in this chapter are either scenario questions or art questions‚ which typically involve higher-order thinking. Among these are two new sets of scenario questions‚ each devoted to a single-species animal phylum. The first pertains to the (possibly) basal animal known as Trichoplax‚ and the second to the bizarre phylum found only on lobster
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Fall 2012 BISC 120Lg – M/W/F 10 A.M. section EXAM 3 Instructor: Dr. Karla Heidelberg PLEASE READ ALL THE INSTRUCTIONS CAREFULLY. 1.DO NOT start until instructed. 2.Make sure you have a total of 9 pages. Instructions for filling in the Blue Scantron Answer Sheet: 1. Enter your name in the NAME field (your last name first)‚ and fill in the appropriate bubbles. 2. Enter your USC STUDENT ID NUMBER in the field labeled IDENTIFICATION NUMBER‚ and fill in the appropriate bubbles
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fruit that we can eat. We can also make other product with its citric acid and their peel in whitening skin and an insect repellent. An insect repellent is a substance applied to skin‚ clothing‚ or other surfaces which discourages insects (and arthropods in general) from landing or climbing on that surface. Effective insect repellents can protect you from serious mosquito- and tick-borne diseases. Chapter I Introduction Background of the Study Enjoying the great outdoors is no fun when you
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Humans need water to survive. Without water‚ the average man would die in a week‚ considering every living cell in the body needs it to continue functioning. What would one say‚ though‚ if they discovered an animal that could go decades without water? Even more‚ that they could survive nearly anywhere‚ including beyond Earth’s atmosphere? Tardigrades‚ often referred to as “water bears”‚ or even “moss piglets”‚ are intensely small creatures with a knack for survival. Belonging to the Tardigrada
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The Burgess Shale Jared Yeargan EES 112 02-32318-2123 May 9th Spring 2012 As scientists seeking clues to the Earth’s and Mankind’s past; expeditions spanning the globe are often launched in search of fossils. Soft-shelled fossils are extremely rare due to their inherent fragility and rarity of necessary conditions to preserve such specimens. The Burgess Shale formation located in British Columbia contains some of the best-preserved and most abundant collections of soft-shelled fossils
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Forensic Entomology Student’s Name Institutional Affiliation Date of Submission Introduction Forensic entomology combines the study of insects and other arthropods with the science of crime investigation. It entails any study of insects that interrelate with legal matters (Hall & Brandt‚ 2011). Whenever a murder crime takes place insects can accumulate in or on the body of the victim. In entomology‚ such insects are considered as part of the evidence. In this regard a major area of emphasis
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Chapter 32 – An Introduction to Animal Diversity All animals share a common ancestor‚ sponges are basal animals‚ eumetazoa is a clade of animals with true tissues‚ most animal phyla belong to the clade bilateria‚ and vertebrates and some other phyla belong Animals share a unique homeobox-containing family of genes‚ known as the Hox genes‚ suggesting that this gene family evolved in the eukaryote lineage that gave rise to animals. Hox genes play important roles in the development of animal embryos
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chordates have gill slits at some point Gills: efficient gas exchange in water Many different types of gills external extensions of body surface dermal papulae: sea stars bracheal tufts: marine worms‚ aquatic amphibians internal gills- fishes‚ arthropods lots of vasculature- blood flow
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