Air is a mixture of gases and atmosphere contains different layers of these gases.So,air only forms the atmosphere.
<span>But atmosphere is not homogeneous.It contains different air masses like cold airmass,warm airmass etc.The interaction of these masses produces weather systems thus affecting the atmosphere.So atmosphere becomes turbulent sometimes because of these airmasses. even tho the atmosphere is air and air is the atmosphere meaning it allows living things to breathe
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All of the systems that are aroused by the <span>sympathetic nervous system</span> are relaxed by the parasympathetic nervous system.
<span>autonomic nervous system (ANS) is a part of the central nervous system that controls all parts that the human cannot have a control on (which are done automatically) like heart rate and breath
ANS is divided in two opposite systems: sympathetic and parasympathetic:
</span>Parasympathetic nervous system: caracterized by the tag "<span>rest and digest" it decreases the heart rate, blood pressure, and breath. It increases the gastrointestinal motricity, letting the organism resting (this happen after a meal).
</span>Sympathetic nervous system: caracterized by the tag "fight or flight" it increases the heart rate, blood pressure, and breath. It decreases the gastrointestinal motricity, letting the organism focus on its environment (this happen when we are in danger).
An earthworm receives support and shape from its fluid-filled cavity. It has Hydroskelton
Explanation:
The muscle of earthworm encloses with two layers of muscle which is circular and longitudinal. There is fluid cavity between digestive part and muscle. it is called coelom and fluid is coelomic fluid. This fluid work as hydrostatic skeleton.
It provides resistance to muscular contraction. It helps the earth worm to applying the force and change the shape. Mostly hydrostatic Skeleton organism has more or less cylindrical. This type of Skeleton found in soft bodied invertebrates.
It's B
Hope that helps, Good luck! (:
Answer:
The correct answer would be - Genetic drift within the small populations in the test tubes resulted in different genotype frequencies
Explanation:
Genetic drift is not like natural selection or adaptive radiation as it is a phenomenon that is random and does not takes place on the basis of genes being beneficial or harmful for survival. Genetic drift depends on any kind of error when the shift occurs in successive generations. Genetic drift also altered the allele frequency of a particular characteristic in future generations.
In this experiment, the sample cultures are transfer from one test tube to another on daily basis for a time period of two months There must be some sampling error that occured and caused the change in allelic frequency as natural selection cannot undergo under such a small population or within such short life span or time period only genetic drift can cause it.