explain why changes of state are physical cha
Common changes of the state include melting, freezing, ...
Pigeons Remember That You Hate Them, Will Probably Plot Revenge Later. … Even after repeated attempts at tricking the pigeons (by swapping the good and bad feeders’ clothes, for instance) the birds still knew which person to avoid.
The question of which came first, the dog or the cat, has long been settled: Canines are the clear winner by what looks increasingly to be tens of thousands of years. But new evidence out of China has placed the date for the origins of the cat there some 3,500 years earlier than previously thought.
5,500 years ago
Evidence of thong bridle use suggests horses may have been ridden as early as 5,500 years ago. The earliest known domesticated horses were both ridden and milked according to a new report published in the March 6, 2009 edition of the journal Science.Mar 5, 2009
The history of pets is intertwined with the process of animal domestication, and it is likely that the dog, as the first domesticated species, was also the first pet. Perhaps the initial steps toward domestication were taken largely through the widespread human practice of making pets of captured young wild animals.
The reason may be primarily about profitability. Turkey’s take up more space, and don’t lay eggs as often. They also have to be raised for quite a bit longer before they begin to lay. This means that housing and feed-related expenses would be considerably higher for turkey eggs compared to eggs from chickens.
Record from China and Egypt show that fowl were domesticated and laying eggs for human consumption around 1400 B.C.E., and there is archaeoligical evidence for egg consumption dating back to the Neolithic age. The Romans found egg-laying hens in England, Gaul, and among the Germans.
The chicken or the egg causality dilemma is commonly stated as the question, “which came first: the chicken or the egg?” The dilemma stems from the observation that all chickens hatch from eggs and all chicken eggs are laid by chickens.
Just as we humans are a particular species within mammals. And just as humans are divided into male and female and children and adults, chickens are likewise. In this context, a man equals a “rooster” and a woman equals a “hen”. Both are generally chickens, but the names indicate their gender and that they are adults.
From Ancient Times
East Indian history indicates that wild fowl were domesticated as early as 3200 B.C. Egyptian, and Chinese records show that fowl were laying eggs for man in 1400 B.C. Europe has had domesticated hens since 600 B.C. There is some evidence of native fowl in the Americas prior to Columbus’ arrival.
A mature female chicken is called a hen. A chick is a newly hatched chicken. An immature male chicken is called a cockerel and an immature female chicken a pullet. A chicken is a bird.
While there was never a time when chickens filled the skies, their ancestors were a bit more adept than current breeds. Domesticated for meat and egg production, modern chickens have developed a smaller wing-to-weight ratio, feet better suited to the ground than branches and beaks built for ground foraging.
Now, as for how do chickens mate, the actual event itself is brief and rather brutal. The rooster mounts the female, and usually grabs the top of her head near her comb. He then stands on her back, and lowers his cloaca. … The hen, meanwhile, inverts her vent, and the chickens touch cloaca.