Which are components of otitis externa management?
a. Using a solution of alcohol and acetic acid to dry and acidify the ear
b. Cleaning the ear canals with a cotton-tipped applicator
c. Ciprofloxacin and hydrocortisone otic drops
d. Taking systemic antibiotics, such as amoxicillin/clavulanate [Augmentin]
e. Keeping the external ear canal dry after swimming

a. Using a solution of alcohol and acetic acid to dry and acidify the ear.

Explanation:

The otitis externa is a medical condition which causes the inflammation of the external ear canal. This occurs due to repeated exposure of the water to the ear canal.

This condition is responsible for pain, and generation of the debris in the ear. One can get rid of this condition by the use of acetic acid or alcohol drops which can change the pH of the ear canal. This will dry and acidify the ear.

50% lit on the left side

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.