Which planet is the biggest?

Jupiter is the biggest and is truly giant. It is large enough for 11 Earths to fit across its face and 1,300 to fit inside it. There are four giant planets in our Solar System. The next biggest is Saturn, followed by Uranus, and Neptune. They are also known as ''gas giants'' because of their colorful, ice-cold gas atmosphere.

Jupiter is shrinking. When it was young it was five times its present size. It is cooling and getting smaller by about 2cm (0.8 in) a year.ha

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WHY IS BLOOD RED?

Blood is red because most of its cells are packed with a red-substance called haemoglobin. Using this, the red blood cells pick up vital oxygen and deliver it to the body's cells. To achieve this and other roles, such as removing waste, blood is pumped along blood vessels by the heart.

WHY DO IDENTICAL TWINS LOOK EXACTLY THE SAME?

Identical twins happen when a single sperm (male cell), fertilizes a single egg (female cell) that then splits in two. Each one goes on to grow into a baby, but both cells share exactly the same genetic instructions (DNA) . DOUBLE (OR TRIPLE) TROUBLE! The number of births in which twins or triplets are likely to occur naturally: 1: Identical twins 4 in 1000 births 2: Non-identical (fraternal) twins 15 in 1000 births 3: Identical triplets 1 in 100000 births 4: Non-identical triplets 1 in 8000 births

WHY DON'T SOME PLANTS HAVE FLOWERS?

Although many plants use flowers to reproduce, some do not. There are more than 30,000 types of these non-flowering plants. Mosses, for example, release tiny spores that are spread by the wind. Conifers make seeds inside scaly cones. Both spores and seeds grow into new plants. Bristlecone pines are oldest trees on the planet. Growing slowly on cold, windswept mountain sides in western USA, they can live for thousands of years. The oldest specimen is known as Methuselah, and is about 4,800 years old.

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