For photoperiodism to occur a plant must use which of the following photosensitive pigments?

Which type of neuroglia is found outside of the brain?

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

Plz ! ive been stuck on this forever