Breathing of contaminated air is the most common way, some can pass through the skin into the blood stream e,g acid
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Child development is simply the developing of children from one age to the next. For example, the development between a pre-teen to a teenager. Not only can be for physical use it also affects children mentally. Children learn during child development causing them to mature faster which is the relation between child development and learning.
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The principle of overload states that the body adapts to every stimulus. Every stimulus needs adaption and in order for a muscle (including the heart) to increase strength,a greater than normal stress or load on the body is required for training adaptation to take place - a different stimulus is required.
Different stimulus can be doing the same workout but in smaller time frame (next stimulus can be to run 5km for 25 minutes, if you have run last time for 30 minutes), or every routine can be done more times...Also changing the workout type is way of changing the stimulus (you can incorporate in you workout routine different sports: running, swimming, hiking..for example).
Plants have sex. It’s true. While it may only be a vaguely similar process to the sex participated in by humans and animals, plants engage in sexual reproduction quite often. There is a series of steps that plants go through to create offspring. It isn’t the most romantic process, but it can be fascinating nonetheless. Learning how plants reproduce sexually can give you a better understanding of the life cycle of the various plants species. The flowering plant is the easiest to understand.
Pollination is the first required step in sexual plant reproduction. The male portion of the plant produces the pollen—typically in the flower. A long filament, called a stamen, holds the bits of pollen at the end and one of several pollinators take the pollen to the female part of the flower, called the pistil. Pollinators can be insects or birds drawn to the plant by the colorful flowers and fragrance for the nectar inside. As they enjoy the plant, the pollen sticks to their bodies and is carried away to another flower that may contain the pistil. The wind can also carry pollen to other flowers, as can water in some species. Some plants have male and female parts on the same flower and can self-pollinate. In any event, pollination requires the movement from the stamen to the pistil so reproduction can continue.
