If the birth rate in a population is 40, and the death rate in that population is 15, then the population will be experiencing growth. The growth will be 25 on every 1,000 people. If this trend continues for longer period, then the population will start to become younger and younger, making the basis of the population pyramid wider, while the top part of it smaller and smaller. This demographic situation in modern times seems to be present only in the less developed countries, with the majority of the transitioning countries having much decreased population growth, and the more developed countries having more deaths than births, thus being aging populations.
Answer:
To study these moths, Dr. Kettlewell placed light and dark moths on the trunks of trees where he could observe them. The same birds would find the dark moth twice as often if the bark on the tree was light. This supported the idea that dark moths had a survival advantage in a dark forest.
Harvest thyme just before the plant flowers for the best flavor. Once the plant begins to flower, the herb begins to lose some of its flavor and potency. The thyme can still be used after it flowers, just expect a milder flavor.
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The study of the properties of light that depend on wavelength is <u>spectroscopy</u>
Explanation:
Spectroscopy is the study of the spectra produced due to the interaction of object or matter with electromagnetic radiations
When light travels through an object, it absorbs and emits light and disperses into a spectrum of its component colors; similar to the pattern of spectral rays observed when light travels through a prism.
Any electromagnetic radiation including the visible light depends upon its properties like frequency, wavelength, and velocity
