A student spends 30 minutes walking outside on a day when the air temperature is 20°C. She then spends 30 minutes walking outside on a day when it is 0°C. On the colder day only, she finds herself very tired when she comes back inside. Explain this observation in detail using your understanding of the concept of homeostasis.

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction. this is an example of speciation.

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils