Calculate the mass percent composition of oxygen in dinitrogen trioxide.

In the film, you saw Jonathan Losos place a male and female trunk-ground anole on an island that did not have any trees but had short grass and shrubs. Losos and colleagues visited the island in following years. What had happened? (Please read carefully!) The two anoles died because there were no trees for them to live in. The average lizard leg had shortened in just two generations. The legs of the two anoles got shorter and their offspring inherited shorter legs. The two anoles reproduced and there were no significant differences in traits from one generation to the next.

One atom of an element weighs 1.79 × 10–22 g. What is the atomic mass of this element in atomic mass units?

Which of the following combinations of names and formulas is incorrect?

Calculate the mass in grams of 8.35 x 1022 molecules of CBr4.

If biological species are defined in terms of reproductive compatibility, the formation of a new species hinges on ________. A) gene flow B) reproductive isolation C) hybrid formation D) gene pool expansion

Balance the following equation for the combustion of benzene: C6H6(l) + O2(g) → H2O(g) + CO2(g) What coefficient was placed in front of carbon dioxide?

How many centimeters are there in 57.0 in? (1in = 2.54 cm)

That whales have pelvic bones is taken as evidence that A) they probably evolved from fish. B) ancestral whales had legs. C) whales should have legs. D) having a pelvis is advantageous. E) whales did not evolve by natural selection

How many moles of NaCl are in 135 g NaCl?