Answer:
D) circadian rhythm
Explanation:
The Circadian Rhythm is often referred to as a "biological clock". This gives the impression that it governed by the organism and without the complete influence of abiotic factors but there are some influences none the less. The rhythms, include physical, mental and changes in behaviour. This is in alignment with the day-night cycle. Most organisms that follow a circadian rhythm respond to a pattern of light and dark. This influences the sleep-wake pattern.
Answer:
Russia, Vietnam, and Laos are three of them but I think there's like 14 or 15 in total
A rare prehistoric fish called the Mangar is only now found in Cuba.
Cuba has the highest doctor patient ratio in the world. So many doctors in Cuba are sent abroad to countries with medical needs.
Cuba has a 99.8% literacy rate, one of the highest in the world.<span />
