It prevents harmful substances from entering a cell. I uses carrier proteins to do so.
Answer:
d
Explanation:
<em>Crossing over shuffles alleles on non-sister chromatids of homologous chromosomes.</em>
At the prophase I stage of meiosis, homologous chromosomes synapsed to form a four-chromatid structure known as tetrad. Exchange of chromosomal segments between non-sister chromatids of the tetrad then takes place, a process that results in the reshuffling of genes or alleles on the non-sister chromatids.
Hence, none of the answers is correct.
Correct option: d
There are two main processes<span> of </span>glacial erosion<span>. The first that we will talk about is plucking, which is defined as the </span>erosion<span> and transport of large chunks of rocks. As a </span>glacier<span> moves over the landscape, water melts below the </span>glacier<span> and seeps into cracks within the underlying bedrock.</span>