What is the most important cause of ocean surface movements? (a) wind (b) salinity (c) desnity (d) temperature

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

Monitor and apply fix up strategies

How does a gymnosperm prevent itself from pollinating the same tree