Some natural processes record the variations in time. For example, the sediments found on the rocks acts to be the great proof of the climate that existed in olden times.
Explanation:
Paleoclimatology is the study of climate records from hundreds to millions of years ago. Information for paleoclimate studies come from natural records. One of the most important natural record from which enormous information about the past climate can be known from the tree ring data. Another source include lake and ocean sediments that are found on the rocks and glaciers.
By measuring the width of Sample of tree rings, sediments , corals and ice, the chemical composition, and physical structure of each layer, scientists can also investigate the conditions present when each layer formed. The data of the natural records can be trusted as these prove to be the greatest source of study of ancient civilizations and how they survived in extreme climatic conditions.
The prefix "poly-" means "more than one" and the suffix "-spermy" is clearly related to sperm. Accordingly, polyspermy is when more than one sperm fertilizes an egg, something that organisms try to avoid.
To avoid this extra fertilization, specific organisms can use "electrical polyspermy blocks" (the fast process), which changes the negative electrical charge of the egg to positive, thus repelling the also positively charged sperm. The slower prevention process is when an organism undergoes a secretion reaction, or a cortisol reaction, which contributes to envelopping the egg by changing its membrane.
Answer:
installing a programmable thermostat to replace your old dial unit or sealing and insulating heating and cooling ducts
Explanation:
Well there are many catastrophic scenarios that we already overcome. You should consider educating yourself about the great filter. A great filter is a hypothetical barrier that each civilization can or cannot overcome. From here on things get a little complex so I won't bore you with them. But there are experts in this theory called great filter and I'm sure they can tell you a lot about.