Which crustal feature is NOT related to plate tectonic activity? A Deep ocean trenches
В.
Mountain ranges
C. Rift valleys
D. Metal composition

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

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.

Arepair man charged $93.06 the price included 2 hours of labor and 40 service charge how much does the repairmen charge per hour for labor?