1. To be useful in science a hypothesis must most importantly be

Would really appreciate it, i have an idea but not completely sure

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

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