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Some heterozygous alleles create variations in expression so that there is not a clear dominant or recessive allele. question 1 options: true false

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.