10 most difficult nature riddlesNature quiz
How much of Australia coastline is desert? (Out of the total 21,262 miles/34,218 km)
140 miles (225 km)
1,000 miles (1,600 km)
3,000 miles (4,800 km)
14,000 miles (22,500 km)
More than 40% of Australia's land is classified as desert, but almost all of it is located inland. The Great Sandy Desert is the only one to extend to the coast, forming the long sweep of the Eighty Miles Beach (which is actually 140 miles long).
For what main reason do chameleons change color?
to match their surroundings
as a social signal to other chameleons
their skin change color when pressed
chameleons do not change color
Colour change in chameleons has various functions, depending on the species, but the most common is social signalling. Only a few species, such as Smith's dwarf chameleon, also adjust their colours for camouflage
Which animals are the most threatened by a prion disease?
Scrapie is infectious and incurable. Recent studies suggest prions may be spread through urine and persist in the environment for decades. Scrapie occurs in Europe and North America, but to date, Australia and New Zealand (both major sheep-producing countries) are scrapie-free.
What mushroom is it?
Toadstool rusty brown
The shaggy parasol is popularly praised as a choice edible mushroom. However, it contains toxins which can cause gastric upsets when eaten raw or undercooked, and some individuals show a strong allergic response even after cooking.
Which rodent has the highest ratio of brain mass to body mass?
Beaver a large semiaquatic broad-tailed rodent that is native to North America and northern Eurasia. It is noted for its habit of gnawing through tree trunks to fell the trees in order to feed on the bark and build dams. Beaver has the highest ratio of brain mass to body weight among rodents, which is reflected in the behaviour and the ability to act not only instinctively, but also logically.
Aside from cattle, which animal provides most milk used by humans?
Water buffaloes provide 11% of the world's milk, which is much more than goats (2%, third place). Buffalo's milk contains higher levels of total solids, crude protein, fat than cow milk; it gives therefore more cheese, butter and other dairy products. The top buffalo milk producers are India and Pakistan.
Which species of cannabis contains the most THC?
Some studies indicate that, on average, Cannabis sativa has higher levels of CBD compared to THC than C. indica. The effects of sativa are well known for its cerebral high, while indica is well known for its sedative effects which some prefer for night time use. Both types are used as medical cannabis.