Which of the following is a blood disorder characterized by crescent-shaped, red blood cells and is caused by a recessive allele that produces an alternate form of hemoglobin?
a. huntington disease
b. sickle cell anemia
c. tay-sachs
d. malaria

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

c

explanation:

the answer is: metamorphic rocks often show the presence of fossils, also a

hope i

-lavira: )

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.