What might cause a cold spell in the northern united states?
a the doldrums move south
b the subtropical high moves north
c the subtropical jet stream moves north
d the polar jet stream moves south

Apea plant that is heterozygous for the tall phenotype can produce short offspring when self pollinating. which of the following explains why this occurs? a. segregation of allels b. condominance of traits c. polygenic expression of traits d. independent assortment of alleles

The body is protected against harmful flu viruses by

Mention true or false : a) cholera is marked by acute diarrhea and no urination. b)mosquitoes are the source of dysentery germs.