Which of the following adaptations to life on land is found in both insects and modern reptiles?
a.
metamorphosis from a larval form
b.
body surfaces that resist evaporation
c.
tracheae to distribute oxygen
d.
ability to fly
e.
two pairs of walking legs

Earth's axis of rotation is tilted at an angle of 23.5 degrees. what is one change you would see on earth if its axis was not tilted?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

What happens when an atom of sulfur combines with two atoms of chlorine to produce sci2? a. each chlorine atom shares a pair of electrons with the sulfur atom. b. an electron is transferred from each chlorine atom to the sulfur atom. c. an electron is transferred from the sulfur atom to each chlorine atom. d. each chlorine atom shares all its valence electrons with the sulfur atom.