Let's start off with an example. Imagine a population of organisms—let's say, deer—with access to a fixed, constant amount of food. When the population is small, the limited amount of food will be plenty for everyone. But, when the population gets large enough, the limited amount of food may no longer be sufficient, leading to competition among the deer. Because of the competition, some deer may die of starvation or fail to have offspring, decreasing the per capita—per individual—growth rate and causing population size to plateau or shrink.
In this scenario, competition for food is a density-dependent limiting factor. In general, we define density-dependent limiting factors as factors that affect the per capita growth rate of a population differently depending on how dense the population already is. Most density-dependent factors make the per capita growth rate go down as the population increases. This is an example of negative feedback that limits population growth.
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Answer: If you're a kid, your heart is about the same size as your fist, and if you're an adult, it's about the same size as two fists. Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.
Parthenogenesis- Continues reproduction despite single-gender dominance.
Parthenogenesis is a form of asexual reproduction (reproduction requiring only one parent) that allows a female organism to give birth to young one without the presence of a female.
Broadcast spawning- allows large production of offspring.
Marine animals, especially the bony fish, commonly reproduce by broadcast spawning, which is an external method of reproduction where the female releases many unfertilized eggs into water and at the same time the male releases a lot of sperm into the water which fertilizes some of these eggs.
Pollination - Obtains genetically different varieties of plants.
Pollination involves the transfer of pollen grains from the stamens, the flowers parts that produce pollen grains, to the ovule-bearing organs or to the ovules. There are many advantages of pollination especially the cross pollination most importantly the introduction of genetic diversity to the plant, which keeps them resistant to diseases.
Herding- protects calve from predators
Many types of animals seek the company of others. Several benefits are gained by the act of gathering into groups of the same species which includes safety from predators, access to mates, and help in finding food.