Answer:
B. secrete granzymes and perforin.
Explanation:
Perforins are the proteins that perforate the plasma membrane of the target cell and lead to bursting of cells due to holes formed in its membrane. Granzymes are the proteolytic enzymes. They serve to stimulate the target cells to kill themselves by the process of apoptosis.
Binding of natural killer cells to their target cells stimulate the release of granules that are filled with perforins or granzymes to kill the target cells.
Likewise, cytotoxic T cells bind to the infected body cells and release the granules filled with perforins or granzymes to kill those infected cells.
easy, study to find out what habitats the dimetrodon lived in, then go to the modern day locations of those prehistoric ecosystems.
i know cause i have been studying extinct, modern and prehistoric animals since i was 2
Answer:
The correct option is<em> B) Meiosis provides for chromosomal variation in the gametes produced by an organism.</em>
Explanation:
Meiosis can be described as a cell division process by which the chromosome number gets reduced to half. This is because half of the chromosomes will come from the female parent and half of the chromosomes will come from the male parent in the offsprings that will be produced when they interbreed.
During the process of meiosis, crossing over and homologous recombination of chromosomes occurs which allows genetic variations among species.
Answer:
The Sun is completely blocked in a solar eclipse because the Moon passes between Earth and the Sun. Even though the Moon is much smaller than the Sun, because it is just the right distance away from Earth, the Moon can fully blocks the Sun’s light from Earth’s perspective.
Explanation:
