<span>diversified
Through random genetic mutations of a species over time, beings with unique characteristics emerged. Based on the suitability of the adaptation to the environment, the beings would either be able to successfully reproduce, or not, and perish. Successful adaptations would be passed down to children, resulting in the adaptations persisting at least in the short term. Charles Darwin is an excellent author to study to learn more about the theory of evolution.</span>
Answer:
Pleistocene Epoch
Explanation:
Modern humans coexisted with woolly mammoths during the Upper Palaeolithic period when the humans entered Europe from Africa between 30,000 and 40,000 years ago. Before this, Neanderthals had coexisted with mammoths during the Middle Palaeolithic, and already used mammoth bones for toolmaking and building materials. Woolly mammoths were very important to ice-age humans, and human survival may have depended on the mammoth in some areas.
The Pennsylvania period, Precambrian period, and the Palezoic Era all existed millions of years before mammoths and humans.
Answer:
The correct answer is b The regulator gene falls off the operator and the structural genes get transcribed.
Explanation:
Tryptophan operon contain3 regulatory genes and 5 structural genes.when adequate amount of tryptophan is present at that time the tryptophan binds to the repressor molecule encoded by tryp R gene.Thus Tryptophan act as co repressor .The repressor molecule bound to tryptophan interacts with operator region resulting in blocking the expression of structural genes.
But when tryptophan is absent at that time repressor molecule cannot function.As a result the repressor molecule fall off from the operator and structural genes get transcribed.
Closes or blink rapidly to protect your eyes
your pupils will also became smaller, so few light source will go through
Nervous system is much more systematic because the impulses are passed as messages through the neurons. The process and the response are very rapid. Endocrine system, on the other hand, is wide range. The process is slow and the effect is long-lasting.