what causes the water on quarters to form a curved dome shape, with the terms surface tension, cohesion and hydrogen bonding

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17