PCBs were frequently used in electrical transformers. A young man digs in an abandoned industrial site, finding old transformers, and sells the copper wire from them to a scrap yard. What health problems might the young man have in the future?
What will be an ideal response?
PCBs may have a feminizing effect on him and reduce his sperm count or even cause prostate or testicular cancer.
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Why is it advantageous for organisms not to be consciously aware of all the activity in their nervous systems?
What will be an ideal response?
Given three genes in order x y z, it is more accurate to measure the distance between x and z directly than to add up the shorter distances between x and y and y and z
Indicate whether the statement is true or false
Which statement about radiolarians is FALSE?
a. They are rhizarians. b. They have axopods. c. They are actinopods. d. They lack silica shells. e. They have algal endosymbionts
Which statement best summarizes the differences between osmosis and diffusion?
A) Osmosis deals only with acidic liquids. B) Osmosis deals only with water. C) Osmosis deals only with alkaline liquids. D) Diffusion deals only with alkaline liquids. E) Diffusion deals only with water.