Answer:
a. A trace fossil is a fossil created from the
remnants of a dead organism.
Explanation:
The sickle cell anemia is genetic disorder, in which the red blood cell becomes sickle shaped instead of its biconcave shape. This condition is a autosomal recessive disorder.
The carriers are the people, who are unaffected by the disorder, but carry one recessive allele, which can cause the disease in next generation. They are hetrozygous for the trait.
It is estimated that 1 out of every 10 or 10% African American are the carriers of the Sickle cell anemia.
So, the correct answer is Approximately, 10% African Americans is a carrier for sickle-cell anemia.
The ciliary muscles behind the iris shape the lens by pulling the choroid up and relaxing the suspensory ligaments. The ciliary muscle changes the shape of the lens within the eye, not the size of the pupil which is carried out by the spincter pipillae muscle and dilator pupillae. When the ciliary muscle is relaxed, the choroid acts like a spring pulling on the lens via the zonule fibers causing the lens to flatten, and when the muscle contracts, it stretches the choroid, releasing the tension on the lens and thus they become thicker.
Hope this helps! :)
The serous membranes are: Peritoneum — the peritoneal cavity is found within the abdominal & pelvic body cavities. Connecting peritoneum forms: — mesentery — ligament. Pleura — two pleural cavities (separated by mediastinum) are found within the thoracic cavity.
Answer:
i think its called aperture