( environmental science) Which statement about environmental policy in the United States is true?

A. All three branches of government are involved in environmental policy.

B.
The environmental policies have always been successful.

C. All important environmental policies are created at the federal level.

D. Environmental policy is based only on scientific information.

Surrounded by microtubules, located near the nucleus. (don't try to google it) (give answer only if u know)

Based on the law of dominance, we would expect percent of the offspring from this cross to have large teeth.

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?