During which step of water purification does water moves through sand beds and activated charcoal?

A) Storage
B) Filtration
C) Chlorination
D) Sedimentation
E) Aeration and settling


B) Filtration

Biology & Microbiology

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Which of the following pathogen agents is multicellular?

A) viruses B) prions C) protozoans D) helminths E) bacteria

Biology & Microbiology

What type of flower should you plant in your garden if you are particularly interested in attracting butterflies?

A. Purple, tubular-shaped flowers with a light floral scent. B. Pendulous red flowers that are open day and night with no scent. C. White day-blooming flowers with abundant pollen and a strong floral scent. D. Yellow flowers with abundant pollen and nectar and a strong floral scent. E. White, night-blooming flowers with a strong floral scent.

Biology & Microbiology

Humans with mutations in the gene encoding AQP1 (aquaporin-1) that cause the absence of AQP1are

characterized by an inability to ____.

a. concentrate urine despite prolonged thirsting d. control sweating b. control edema e. salivate c. make large volumes of dilute urine

Biology & Microbiology

Which of the following hormones is involved most directly in carbohydrate absorption?

1.gastrin 2.secretin 3.cholecystokinin 4.glucose insulinotropic peptide

Biology & Microbiology