Scientists have identified approximately ________ million species of organisms, but millions more are thought to exist

Fill in the blank(s) with correct word


1.75

Biology & Microbiology

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In chickens, females have two different sex chromosomes (Z and W), while the males have two Z chromosomes. A Z-linked gene controls the pattern of the feathers, with the dominant B allele causing the barred pattern and the b allele causing nonbarred feathers. Which of the following crosses would produce all daughters of one type (barred or nonbarred) and all sons of the other type?

A) barred females × nonbarred males B) nonbarred females × barred males C) nonbarred females × nonbarred males D) barred females × barred males E) More than one of the choices is correct.

Biology & Microbiology

A human heart cell contains chromosomes.

A. 16 B. 4 C. 2 D. 23 E. 46

Biology & Microbiology

What is the most likely source of various

hangover symptoms?

a. acetate b. acetaldehyde c. ethanol d. alcohol dehydrogenase e. carbon dioxide

Biology & Microbiology

Most of the oxygen in the blood is transported by

a. plasma. b. serum. c. platelets. d. hemoglobin. e. leukocytes.

Biology & Microbiology