A monhybrid cross is the inheritance of a single character and dihybrid cross is the inheritance of two difference character.
I think it might be the first one: hiv infections. (hope this helps!)
Cells do need food. In a process known as cellular respiration, cells convert biochemical energy (oxygen as food) from nutrients into adenosine triphosphate (ATP), and then release waste products.
hope this helps.. :D
Balancing, running, and jumping are all examples of <em>gross</em> motor skills.
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I quote from Wikipedia:
"Gross motor skills are the abilities usually acquired during childhood as part of a child's motor learning. By the time they reach two years of age, almost all children are able to stand up, walk, jump, run, walk up stairs, etc. etc."