Because the sinoatrial node sends out impulses that initiate each heartbeat, it is often referred to as the ________ of the heart

Fill in the blank(s) with correct word


pacemaker

Biology & Microbiology

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____________________ involves the fertilization of the egg outside the body, followed by transfer of the embryo into a woman's uterus

Fill in the blank(s) with correct word

Biology & Microbiology

In which tissues could abundant collagen and elastin be found?

a. muscle tissues b. connective tissues c. epithelial tissues d. nervous tissue

Biology & Microbiology

In a monocot stem, vascular bundles are arranged in a circle

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

Bacterial plasmids

A. are essential for chromosome replication and binary fission. B. are artificially created by humans and are present in bacteria only because humans put them there. C. can provide genes that allow the bacteria to grow and thrive in the presence of potential toxins. D. are essential for growth. E. are essential for cellular respiration.

Biology & Microbiology