Sickle cell anemia is a genetic disorder obtained from a. exposure to large quantities of toxic chemicals b. a skin mutation caused by ultraviolet light c. inheriting a mutation in the dna sequence of a particular gene. d. exposure to a blood-related pathogen.

Mention true or false : a) cholera is marked by acute diarrhea and no urination. b)mosquitoes are the source of dysentery germs.

Paint and solvents pose no potential hazard to human health. select the best answer from the choices provided t f

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid