Clothespin Essay Example

Clothespin Essay Example Clothespin Essay Clothespin Essay Facilitator tells participant, You are to squeeze the clothespin as many times as you can for 1 minute using only your index finger and thumb. As you squeeze the clothespin, count how many times you are able to. With 10 seconds remaining, you will receive a warning. 2. Allow participant to begin when facilitators starts the stopwatch and says Begin. At 50 seconds, the facilitator must provide the 10 second warning saying, You have 10 seconds remaining. 3. At the end of the minute, the facilitator will take the clothespin, cord the number of clothespin squeezes, and wait 20 seconds. . At 20 seconds, the participant will do 30 jumping jacks. 5. After the 30 jumping jacks, the facilitator will give the clothespin back to the participant and will start the one minute timer. 6. Repeat steps 2 and 3 In this experiment, controlled variables include using the same clothespin, using the index finger and thumb to hold the clothespin, and all participants receiving the 10 second warning. The independent variable of the experiment is the jumping jacks performed by the participant. The dependent arable of the experiment is the number of squeezes of the clothespin in one minute. Data Collected: The data that was collected from this experiment does support the hypothesis. The hypothesis States that the participant will squeeze the clothespin fewer times after exercising because exercising takes energy, making squeezing the clothespin harder as less energy is getting to cells. Suggestions for Improvement: An error that could have occurred in this experiment is the inconsistency of how long it takes for the participant to do one jumping jack. This error is mainly based on human variety. Three additional variables that may have influenced the outcome of the experiment are age of participants, physical condition of participants, and the possibility of dropping the clothespin during the trial, causing the participant to restart the test. Suggestions for Further Research: Two other investigations that can be done are testing which arm muscle groups get fatigued while squeezing the clothespin and what exercise drains the most energy from the participant. To further support this experiments findings, the trials can be performed with a more diverse group of participants.

Flatback Sea Turtle Facts

Flatback Sea Turtle Facts Flatback turtles (Natator depressus) live primarily on the continental shelf of Australia and nest only on Australian beaches. Despite their limited range, probably less is known about this sea turtle species than the other six sea turtle species, which are more wide-ranging. Initial classification of flatback turtles led scientists to think they were related to Kemps ridley or green sea turtles, but evidence in the 1980s led scientists to determine that they were a separate, genetically distinct species. Description The flatback turtle (also called the Australian flatback) grows to about 3 feet in length and weighs about 150-200 pounds. These turtles have an olive-colored or gray carapace and pale yellow plastron (bottom shell). Their carapace is soft and often turns up at its edge. Classification Kingdom: AnimaliaPhylum: ChordataClass: ReptiliaOrder: TestudinesFamily: CheloniidaeGenus: NatatorSpecies: depressus (referred to as depressa in the World Register of Marine Species (WoRMS)) Habitat and Distribution Flatback turtles are found in the Pacific Ocean, primarily in waters off Australia and Papua New Guinea and occasionally off Indonesia. They tend to frequent relatively shallow, coastal waters less than 200 feet deep. Feeding Flatback turtles are omnivores that  feed on invertebrates such as jellyfish, sea pens, sea cucumbers, crustaceans and mollusks, and seaweed. Reproduction Flatback turtles nest along the northern coast of Australia, from Western Australia to Queensland. Males and females mate offshore. Mating often results in bites and scratches in the females soft skin, which later heal. Females come ashore to lay their eggs. They dig a nest that is about 2 feet deep and lay a clutch of 50-70 eggs at one time. They may lay eggs every 2 weeks during the nesting season and return every 2-3 years to nest. Although the egg clutch size of flatback turtles is relatively small, flatbacks lay unusually large eggs - even though they are a medium-sized turtle, their eggs are almost as big as those of the leatherback - a much larger species. The eggs weigh about 2.7 ounces. The eggs incubate for 48-66 days. The length of time depends on how warm the nest is, with warmer nests hatching sooner. The baby turtles weigh 1.5 ounces when they hatch and carry undigested yolk, which will nourish them during their initial time at sea. Flatback turtle nest and hatchling predators include saltwater crocodiles, lizards, birds, and crabs. Once they reach the ocean, hatchlings do not go into deeper waters like other sea turtle species but stay in shallow waters along the coast. Conservation The flatback turtle is listed as Data Deficient on the IUCN RedList, and vulnerable under the Australian Environment Protection Biodiversity Conservation Act. Threats include harvesting for eggs, bycatch in fisheries, nest and hatchling predation, entanglement in or ingestion of marine debris and habitat destruction and pollution. References and Further Information Australian Government. EPBC Act List of Threatened Fauna.IUCN Marine Turtle Specialist Group. Flatback Turtle: Natator depressus .Red List Standards Petitions Subcommittee 1996. Natator depressus.  IUCN Red List of Threatened Species.Spotila, James R. Sea Turtles: A Complete Guide to Their Biology, Behavior and Conservation 2004. The Johns Hopkins University Press.SWOT. State of the Worlds Sea Turtles.Waller, Geoffrey, ed. SeaLife: A Complete Guide to the Marine Environment. Smithsonian Institution Press. Washington, D.C. 1996.