Trilobites were abundant in pennsylvania. trilobites were among the first of the arthropods, a phylum of hard-shelled creatures with multiple body segments and jointed legs. their fossils first appeared in early cambrian period about 570 million years ago. the trilobite fossils show that during most of this time pennsylvania was providing favorable conditions for the trilobites.
a) glacial terrain
b) a dry and sandy plain
c) mostly mountain ranges
d) covered by warm, shallow seas

Sampling lake water for microscopic organisms is not as easy as it sounds when you want to both count and identify species. in a given water sample, your bacteria of choice can be rare or difficult to culture, particularly given the mixture of bacteria in a biofilm. which of the following culture media would be best for growing fecal coliforms when they are relatively less abundant than other bacteria in the lake? anaerobic culture medium enrichment culture medium complex culture medium basic culture medium

Anurse is preparing to administer ampicillin 500 mg in 50 ml of dextrose 5% in water (d5w) to infuse over 15 min. the drop factor of the manual iv tubing is 10 gtt/ml. the nurse should set the manual iv infusion to deliver how many gtt/min? (round the answer to the nearest whole number. use a leading zero if it applies. do not use a trailing zero.)

Gene expression is the activation of a gent that results in a question 1 options: protein dna mitochondria