How do environmental scientists use technology to track the invasive species silver carp? a. they use unmanned aerial systems to photograph carp. b. they use biostimulation to promote carp feeding. c. they use acoustics to identify carp sounds. d. they use gel electrophoresis to detect the presence of carp dna.

Environmental scientists use gel electrophoresis to detect the presence of carp DNA. Option D is correct

Natural resource agencies have established surveillance programs which use environmental DNA  for the early detection of bighead carp Hypophthalmichthys nobilis and silver carp Hypophthalmichthys molitrix before they establish populations within the Great Lakes. This molecular monitoring technique must be highly accurate and precise in order to achieve a confident interpretation as well as efficient, both in detection threshold and cost

my dad purchased natural colorings in a specialty store

in ray bradbury's short story "a sound of thunder", mr. eckels's fearfulness leads to drastic consequences for the rest of the world.

in the story, mr. eckels, who is a hunter, hires a time travel company to travel to the age of dinosaurs. although he is excited for the hunting expedition at the beginning, when they reach there and mr. eckels sees the tyrannosaurus, he feels frightened. as he is afraid of the tyrannosaurus, he steps off the path although he has been warned not to do it. by stepping off the path, the entire course of the future is affected: mr. eckart alters the future by stepping on a butterfly, which causes a new man to be elected president in the future. in that way, it is mr. eckart's fearfulness what triggers 'the butterfly effect' and what leads to drastic consequences for the rest of the world.