I'm pretty sure that its the 3rd answer
Answer:
The pressure differences on either side of the valve.
Explanation:
The heart valves open and close passively because of pressure differences on either side of the valve. When pressure is greater behind the valve, the leaflets are blown open and the blood flows through the valve. However, when pressure is greater in front of the valve, the leaflets snap shut and blood flow is stopped.
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When a cell undergoes meiosis,the outcome of the process is FOUR HAPLOID CELLS.
Meiosis refers to a form of cell division which always results in the formation of four daughter cells. The four daughters cells produce have diploid cells which contains half the original of chromosomes from the parents. A diploid cell has two of each chromosome, one from each parent. The eggs and the sperms that are involved in reproduction possess haploid cells. In meiosis, the whole process start with diploid cells which divide twice to produce four haploid cells.
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In these species, the populations fluctuate by having spikes due to the surface temperatures that increase as a consequence of global warming. It is a consequence of global warming in natural populations.
<h3>Global warming</h3>
Global warming refers to the constant increase in temperatures on Earth's surface due to human activities.
The human activities that lead to global warming include deforestation, burning fossil fuels, and farming livestock.
Global warming affects warm water species by the increase in water temperatures, thereby affecting also water quantity and water quality.
Learn more about global warming here:
brainly.com/question/3553382
