Cystic fibrosis (CF) affects both males and females and people from
all racial and ethnic groups. However, the disease is most common among
Caucasians of Northern European descent.
CF also is common among Latinos and American Indians, especially the
Pueblo and Zuni. The disease is less common among African Americans and
Asian Americans.
Despite their seemingly simple anatomy and radial symmetry Sea urchins and sea star are a type of deuterostome, closely related to the chordates.
What are the characteristics of deuterostome?
Animals classified as deuterostomes share a common embryonic development.
The first opening during development known as the blastopore changes to the anus in deuterostomes while the mouth changes in protostomes.
They have a coelom, which forms as a result of enterocele (coelom from the digestive tract).
These creatures include the following,
- Chordata,
- Echinodermata,
- Hemichordata.
Hence the correct answer is Deuterostome.
Learn more about Deuterostome,
brainly.com/question/12500582
# SPJ4
Since it is outside your body, the answer is B, external stimulus
