Homologous structures are features that are similar in structure but appear in different organisms and have different functions, and are also evidence of common Therefor, the striped coat of the zebra and the tiger are homologous features, so D. is the correct answer.
When that situation happens then it can stimulate a cytotoxic T cell. This types of cells are the ones directly responsible for cellular immunity. Cytotoxic T cells can attack target cells by secreting a cytokine that triggers apoptosis which is <span>the death of cells which occurs as a normal and controlled part of an organism's growth or development.</span>
Transport proteins move objects and materials into and out of the cell that are either too large, or too polar to cross the membrane on their own. This process is also passive by the way - meaning no ATP is required.
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Answer:
Permafrost is ground that continuously remains below 0°C for two or more years, located on land or under the ocean. Permafrost does not have to be the first layer that is on the ground. It can be from an inch to several miles deep under the Earth's surface.
Explanation:
The Answer Is Coal Because Once We Use It All Up Its Gone
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