d. an opening specified for waste removal is present
Bears remove undigested food through an opening designated for waste removal, also known as the anus. This is characteristic of an alimentary canal system where food enters orally and waste leaves through a separate exit. This type of digestive system is referred to as monogastric.
In the case of bears, and other animals with a similar monogastric digestive system, the undigested food is excreted via an opening designated for waste removal as suggested in option D. The process begins in the mouth where food is broken into small particles. This food then travels to the stomach where digestion continues with the breakdown of large molecules. The digested nutrients are then absorbed into the body in the intestines. Any undigested food that is not absorbed is removed as feces through an opening known as the anus. This type of digestive system is also known as an alimentary canal, which is a complete system with an oral intake and a separate waste removal opening.
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Answer:
Cells are small because they need to keep a surface area to volume ratio that allows for adequate intake of nutrients while being able to excrete the cells waste. That is why the cell needs to be small. The smaller it is, the larger the surface area to volume ratio is. ... This is why cells are so small.
explicación:
The important point is that the surface area to the volume ratio gets smaller as the cell gets larger. Thus, if the cell grows beyond a certain limit, not enough material will be able to cross the membrane fast enough to accommodate the increased cellular volume. ... That is why cells are so small.
Cells are small to have a high surface-to-volume ratio and efficient exchange of materials with their environment.
All cells are very small because they need to have a high surface-to-volume ratio. The surface area of a cell determines the amount of substances that can enter or leave the cell, while the volume of the cell determines the amount of metabolic activity that can occur. By being small, cells can efficiently exchange materials with their environment and carry out essential functions.
For example, red blood cells are small to pass through the narrowest capillaries and transport oxygen to different parts of the body. Bacteria are also small to facilitate their nutrientuptake and waste removal.
Furthermore, the small size of cells allows them to have a faster rate of diffusion, which is important for the exchange of gases, nutrients, and waste products across the cell membrane.
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Answer:
A heterozygous trait contains two different allelic forms of a gene in which one is a dominant allele and one is recessive allele. If there is a crossing between two plants that are heterozygous for their trait then the probability of expression of the dominant allele is 3/4.
So according to this question plants are heterozygous that means the genes would be like Pp and Pp. Here P indicates the purple color allele which is dominant and p indicates recessive white color allele.
Therefore cross between these two will give genotypes PP, Pp Pp, and pp. So according to the law of dominance that says dominant allele will express itself, therefore, probability of purple-flowered offspring is 3/4 because 3 out of four genotypes have the dominant allele.