The best and most correct answer among the choices provided by your question is the fourth choice or letter D. Reptiles are the most critically endangered animal group. Their population is threatened due to illegal activities done by man like poaching.
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Folic acid is a necessary component of the diet of pregnant women in order to prevent neural tube defects.
<span>D. 9 </span>
<span>Notice that diploid cells which 18 are the complete number of chromosome pair of the organism. This usually happens under cell divison –mitosis which process of replicating oneself to produce another like cell. Meiosis occurs in gametes, sex cells. Their respectively called spermatogenesis (sperm cells) and oogenesis (egg cells). These cell division –meiosis produces haploid cells, in which in words “half” from the complete cell chromosome number, hence, these </span>haploid cells<span> only produce half number or one set of chromosome (9) instead of the complete pair which in this case, 18.<span>
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A protein that is exposed to heat or drastic change in pH will have its structure affected. Conditions that are beyond the optimum conditions for the survival of proteins will affect their structures adversely, causing them to lose their unique three dimensional structures. This is in turn will leads to the denaturation of the proteins and the proteins will no longer be able to perform their original functions.
