Science quizes – answers
Posted by admin on November 11th, 2010
- Its structure. Their web contains no adhesive properties but has an irregular structure that tangles insects.
- Copper. Hemocyanin carries the oxygen in the ‘blood’ (hemolymph) of some arthropods. It gives the blood a blue (cyan) colour.
- Night. Their vision is strongest in black and white, which aids in the detection of movement.
- About three kilometres. It takes approximately three seconds for sound to travel one kilometre through the atmosphere.
- Plasma (it has little nutritional value). Within two minutes of sucking the blood of its victims, it excretes plasma-rich urine in order to become light enough to take-off again.
- The point around which two bodies orbit. The barycentre of the Earth and Moon is approximately 1700 kilometres below the Earth?s surface, which makes the Moon appear to orbit around the Earth.
- Only the pulmonary arteries carry deoxygenated blood (from the heart to the lungs).
- The mercury rises the highest on Venus. The surface temperature is over 400oC.
- None. The density difference between ice and water means that even though the ice pokes out the top of the surface of the water, when it melts it still does not cause a rise in the level of water.
- Temperature of the embryo?s environment. If the egg is kept between 31.6 and 34.5oC, the crocodile will be a male. Hotter or colder and it will be female.
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