18.Oryana+Metcalfe



Cows and dogs have Similar digestive systems, the main difference is that a dog is monogastric and a cow is ruminant, that means that the cow has four complex stomach chambers and dogs have one simple stomach. Cows have mainly premolars, molars, and incisor teeth, where dogs have mainly canines and incisor teeth.

Radioisotopes

1. What are radio isotopes used for in medicine? 10000 hospitals worldwide use radioisotopes, 90% is used for diagnosis and/or treatment.

2. Provide 3 examples of radioisotopes and list where it is used.

Palladium-103 (17 d): Used to make brachytherapy permanent implant seeds for early stage prostate cancer. Erbium-169 (9.4 d): Use for relieving arthritis pain in synovial joints. Selenium-75 (120 d): Used in the form of seleno-methionine to study the production of digestive enzymes.

3. Choose one of your examples and describe the process.

Erbium-169 (9.4 d): Use for relieving arthritis pain in synovial joints. Erbium reduces the swelling, is aninflammatory, and is used in form of citrate for the treatment of rheumatoid arthritis.

4. Pros and cons Pros- can cure, help and detect diseases in humans and animals Cons- exposue to soothes and radoisotopes can cause problems and radioactive related problems. Some people may not have the strength and proper physical attributes to withstand effects of isotopes and radioisotopes.

Mosquito Fish

What is its scientific name? Gambusia affinis

Diagram

Why was the mosquito fish introduced? The mosquito fish was introduced in Australia in 1925 to controll the number of mosquitos and mosquito born diseases in Australia.

Adaptations and advantages The mosquito fish has: ~A high tolerance for salinity, can thrive in many environments ~Strong resistance to pollutants, will remain healthy and live longer in polluted water ~ Thermal adaptations that allow it to live in inland and coastal areas of temperature between 0.5-35 degrees Celsius. ~ Superiour mouths for top feeding, can eat quickly, with precision and ease ~ Can swallow air directly form the atmosphere when needed,scan live in under oxygenated waters ~ Has a greenish-olive to brown colour to blend in with it's environment ~ Can have four broods in one year 50 fish per brood, 3-4 weeks gestation period, therefore they have a high reproductive rate which increases their abundance.

Ecosystem, abundance, distribution The impact of mosquito fish on the ecosystem is both positive and negative. It has had a definite impact on the number of Mosquitos all over Austrailia due to their diversity to live in many different climates. The mosquito fish can also be a problem for other native fish which also feed on mosquito larvae. As the number of Mosquitos decrease, so do the amount of larvae and therefore impacting not only native fish, but other aniMac species whichfeelson the larvae.

The exact number of mosquito fish in Australia is not know but is assumed too be somewhere in the hundred-thousands.They are small and agile and live in many depths and