Embryonic stem cells cannot develop into ____ cells

a. muscle
b. nerve
c. blood
d. placental
e. other stem


d

Biology & Microbiology

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The flagella of bacteria rotate at their bases like propellers

Indicate whether the statement is true or false.

Biology & Microbiology

Which fossil would be the oldest in a given strata and why? What will be an ideal response?

Biology & Microbiology

Which statement about the regulation of respiration is FALSE?

a. Respiratory centers in the medulla control the transition from inspiration to expiration. b. Carbon dioxide concentration is the most important chemical stimulus for regulating respiratory rate. c. Chemoreceptors in the walls of various arteries are sensitive to carbon dioxide levels in the blood. d. A group of neurons in the ventral medulla only become active when we need to breathe forcefully. e. Chemoreceptors may be sensitive to oxygen, carbon dioxide, and/or hydrogen ion concentration.

Biology & Microbiology

A scientific theory is _________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology