Answer:
A-
Tides are caused mainly by <u> </u> in how much the moon's gravity pulls on different parts of Earth.
The force of gravity pulls the moon and Earth toward each other.
The moon's gravity causes high tide on the side closest to the moon.
The moon's gravity pulls Earth, leaving water behind causing an additional high tide.
Low tides occur between the two high tides.
There are 2 low tides and 2 high tides a day.
B-
Their combined forces produce a tide with the greatest difference between consecutive high and low tides, called a spring tide.
Spring tides occur once a month, at new moon and at full moon.
During the moon's first-quarter and third- quarter phases, the line between the moon and the sun is at right angles to the line between Earth and the moon.
This produces a spring tide, a tide with the greatest difference between consecutive low and high These occur twice a month.
(sorry I didn't really understand the first one)
Answer:
<u>Barbara must be suffering from tension headache.</u>
Explanation:
<u>Tension headaches </u>are caused due to stress, here in this case Barbara is stressed because of excess workload and low productivity. Tension headaches are a type of primary headaches and its intensity increases gradually. the pain can travel from head to neck.
(Primary headaches: These headaches are not caused as a result of any other medical problem.)
Answer:
Autoimmune theory
Explanation:
Alzheimer's disease is the most common type of neurocognitive disorder, which usually occurs after the age of sixty-five and is characterized mainly by memory impairment.
The autoimmune theory suggests that <u>the immune system is prearranged so that it becomes unable to identify the body's proteins from foreign ones</u>. As a result, the immune system attacks its own cells.
Unfortunately this question is incomplete as it does not provide any choices. However, there are certain ecological factors that can cause a population of mice to decrease quickly. One is an increase in predation. Many carnivorous animals prey on mice, including birds of prey, foxes and various other predacious mammals, as mice are small and high in number. This means a lot of mice are removed from the population through predation. Any increase in predator pressure could quickly disturb the balance in the mice population. Another factor is a disease. Some diseases can seriously deplete populations of animals, with the remaining hardier individuals developing immunity.