Phospholipids have a polar side and a
non-polar side, where is
each side found in a cell
membrane?

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun

How many chromosomes are in a human gamete?

Which of the following is true about the introduction of a non-native species to an environment? (a) they usually adapt quickly so they can have a positive affect on the environment. (b) they can disrupt the environment and cause much damage and devastation to native species. (c) they usually become predators in a food chain and to keep prey populations under control. (d) because the native species are better-adapted to the environment, the non-native species always end up dying out.