BC: The End
FC: Answers to Natural Curiosities | How long is the human DNA? | Do viruses die? | Why do we age? | Do blind people see their dreams?
1: Curiosity is the very basis of education and if you tell me that curiosity killed the cat, I say only the cat died nobly. Arnold Edinborough
2: All the research was carried out by Form 3 Biology students. They used BBC Focus magazine as the basis of their research. All the information was compiled by Form 3 Biology students & Ms N Scerri
3: Why do we cover our mouths when shocked? | When someone is truly shocked, his first instinct is to scream. Covering of the mouth is actually a secondary reaction, in order to moderate the initial response. It might be because the event is not so dangerous, or not to alarm those around. It probably evolved to avoid spreading unnecessary panic in groups.
4: Which is the longest-living animal? | Since sponges are included with the Animal Kingdom, then the giant barrel sponge should win the prize, with specimens estimated at over 2,300 years old. | Among mammals,the longest lived are whales, especially the bow-head whale. Their average lifespan was believed to be around 60-70 years although there is increasing evidence to suggest they can live beyond 100 years.
5: Lips allow humans to: chew and swallow with their mouths closed; hold on to things such as a pen, a pencil and a clothes peg; suckle at the breast when still a baby. | Why do humans have lips? | Lips allow humans to communicate. They allow humans to smile, to bare their teeth and to kiss.
6: Why do we have ear wax? | Earwax is a mixture of shed-skin cells, long chain fatty acids and other oily compounds that are secreted from specialized sweat glands . Wax removes dust, dirt and prevents dead bugs from entering your ear. Ear wax is slightly acidic, which inhibits the growth of some fungi and bacteria.
8: Why do mosquitoes bite some people and not others? | Their antennae have 72 different types of odour receptors and 27 of these are tuned for chemicals found in human sweat. People who get bitten more are simply those with higher concentrations of such chemicals in their sweat.
9: The world's largest wasp is the Asian Giant Hornet. It can grow to 5.5cm in length, about the same as your little finger. It has a wing span of 7.6cm. The Asian Giant Hornet can inject poison that is powerful enough to dissolve a human tissue. | Which is the largest wasp?
10: Elephant | Sperm Whale | African Grey Parrot
11: Which animal has the largest brain? | The animal which has the largest brain is the sperm whale. Its brain weighs 8 kg. Although it has a very big size it doesn't mean that it is the most intelligent mammal. | Other brain masses: Elephant's: 5 kg Human's: 1.4 kg African grey parrot's: 8g
12: The stomach does not growl when someone is hungry only. Growling may occur when the stomach is both empty or full. It is usually associated with hunger since the growling is louder when the stomach is empty. Growling is due to contractions of the stomach and intestinal muscular wall. When empty, contractions will squeeze air backwards and forwards, causing the empty space to vibrate, and produce the loud sound. | Why does the stomach growl when you are hungry?
13: Did you know that Stegasourus Dinosours, which roamed the earth in the Jurassic age,had brains the size of walnuts. Their brain accounted a tiny 0.002 per cent of their total body weight which was around 3.3 tonnes (3300 kg) | Stegasourus Dinosours
14: Strictly speaking viruses can't die, for the simple reason that they aren't alive in the first place. Although they contain genetic instructions in the form of DNA, viruses can't thrive independently. Instead they must invade a host organism. Some infections remain for a short time while others can easily remain for years. | Do viruses die?
16: Do giraffes get dizzy? Not too dizzy. Fortunately for them, giraffes have hearts that weigh more than 11 kg and can generate twice as much blood pressure as humans can.
17: Do animals have identical twins? Yes, but rarely. Puppies and kittens in one litter are usually fraternal twins, developing from eggs and sperms from the same mother and father. Sometimes a single zygote splits in two to create two identical twins.
18: Do parrots have taste buds? Parrots have 350 taste buds, which are very few when compared to the 9000 taste buds owned by humans. Their taste buds are at the back of their throat and on their tongue. Like humans, they can distinguish sweet, sour, bitter and salt tastes. | Many birds need to taste bitter, so as to avoid poisonous food. Only a few birds, such as the parrot and humming bird, can taste sweetness.
19: Why do we age? Our body cells may live for a few days, a few weeks or several decades. The process of producing new cells becomes unreliable as the years pass by. The DNA carrying the instructions for cell processes becomes damaged, eventually preventing any more cell divisions. The result is an increasing level of the process known as aging!
20: Our bodies are aligned with a centre of gravity that passes down our spines to our feet without needing a tail to counterbalance the weight of our head. Besides, it is simply a waste of energy growing and maintaining a tail, when it is definitely not needed. The only period humans have a tail is in the first four weeks of their life in the womb. | Why don't humans have tails?
21: Various studies have shown that people who are blind from birth don't have a visual component to their dreams. They do dream sounds, touch, taste and smell, which are all much more unusual in the dreams of sighted people. | Those who lose their sight after the age of seven, normally retain some visual images in their dreams. | Do blind people see their dreams?
22: How long is the human DNA? The majority of the human cells have 46 chromosomes. It is only the sex cells that have 23 chromosomes. The DNA, a helical molecule, is super coiled and therefore takes up little space in the cell. The DNA in one cell is around 2m long. All the DNA in all the body cells put together would be about twice the diameter of the Solar System!!
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25: Contributors | Abigail Agius Ylenia Attard Melanie Azzopardi Nicole Barbara Jade Camilleri Julia Cini Cheryl Cortis Cutajar Bernardette Shazy Dimech Rebecca Marie Falzon Sarah Marie Falzon Alexia Farrugia Dorianne Galea Maria Xuereb Melanie Zahra Cristina Zammit