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
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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
In which tissues could abundant collagen and elastin be found?
a. muscle tissues b. connective tissues c. epithelial tissues d. nervous tissue
In a monocot stem, vascular bundles are arranged in a circle
____________________ Indicate whether the statement is true or false.
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.