To signal hunger, the physiological need for food, the digestive tract sends messages to the hypothalamus by way of hormones and nerves.
Answer:
species vary globally.
Explanation:
The importance of biodiversity lies in the past, in the present and in the future. In the past, because from there we left about 4,000 million years ago; in the present, because it is what we have our senses on and, in the future, because it is the commitment of each and every human being to know, protect and preserve the diverse life.
It is enough to mention the meteor showers, fractures and collisions of the continental plates, early warned in the works of scientific visionaries such as Wegener and Croizat, father of panbiogeography, who explained with much property that some plant species, such as those of the genus Notophagus of Patagonia were only found in Australia and New Zealand and, that other species belonging to other botanical families, had a similar pattern. With acute observations, he found evidence similar to the distribution pattern for species of aquatic animals and plants, which he explained as a consequence of the oscillation in the amount of water in the seas. In the same way it happens with the marine aquatic iguana found in Galapagos Island.
Answer:
Because it is inevitable and no one truly knows what to expect from it.
