They can respond to external stimuli
Yes, fish can sleep! Fish do not have eyelids to close, so they sleep with their eyes open. Depending on the species, fish can sit on the floor of a bowl, for example, to sleep. Others drift close to the bottom.
In humans<span>, each cell normally contains </span>23 pairs of chromosomes<span>, for a total of 46. Twenty-two of these </span>pairs<span>, called autosomes, look the same in both males and females. The 23rd </span>pair<span>, the sex </span>chromosomes<span>, differ between males and females.</span>
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