Two trees growing close to each other both use light and water, and the same nutrients in the soil. This relationship is best defined as: a : symbiosis
b : competition
c : interdependence
d : none of the above

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

Mutations associated with albinism affect proteins involved in synthesis

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2