The object (Theia) was about the size of Mars.
Answer: (A) Natural selection tend to reduce genetic variation as there was a smaller distribution of beak depths, but it tends to select for the most fit phenotypes, as there was an increase in average beak depth after the drought.
Explanation: The picture below shows proof if needed. On USATP
Answer:
While exercise is a common cause of muscle fatigue, this symptom can be the result of other health conditions, too.
Causes of muscle fatigue
Addison's disease.
age.
anaerobic infections.
anemia.
anxiety.
botulism.
cerebral palsy.
chemotherapy.
Zero; myocardial infarction. The posterior interventricular artery supplies much of the left ventricle, the systemic pump .
These are called igneous rocks due to them being made from lava from an volcanoe eruption,