Answer:
B-cells have B-cell Receptors on their surfaces that can recognize million different types of antigens. .......T cells too have T-cell Receptors that detect the antigen on the surface of the Antigen are presented to the T-cell through a MHC-Antigen complex.
Explanation:
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To exhibit a recessive trait, an individual must have two recessive alleles responsible for the trait. One recessive allele is from a mother and another is from a father. However, if a person has one dominant and one recessive allele, it will not exhibit the recessive trait. This is because recessive allele will be masked by the dominant allele. So, parents must be heterozygous (one dominant and one recessive allele) and must give their recessive alleles to the offspring so that only offspring exhibit the recessive trait.
Pituitary gland is the endocrine gland that communicates with hypothalamus in our body growth.
Answer:
Option B
Explanation:
Please see the attachment
Answer:
The Archean Eon marked a time when Earth’s climate began to stabilize.
Earth cooled down from its molten state. It eventually could support oceans. Tectonic activity built continents.
In the Archean Eon, oxygen filled the atmosphere and most of the world’s iron ore was deposited.
Because the Earth’s conditions stabilized, eukaryotic and multicellular life could finally emerge in the Proterozoic Eon.
Explanation:
