What type of tissue makes up the epidermis of the skin?.

In the context of the neural impulse, which of the following is true about the depolarization of neuron membranes?

Aresearcher has developed two stains for use with seed plants. one stains sporophyte tissue blue; the other stains gametophyte tissue red. if the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur? a) the pollen grains will be pure red. b) the pollen grains will be pure blue. c) the pollen grains will have red interiors and blue exteriors. d) the pollen grains will have blue interiors and red exteriors.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.