A man with blood type B had a father whose blood lype was 0. This man marries a woman whose blood type is A. a) The man's wife has a child with blood type A. Can he be the biological father? b) Further study shows that the baby's genotype is I^A l^A, can he be the biological father? Support your answers with Punnett squares.

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.