Correct Answer: A) growth rate

Explanation

The question is asking about the weights of five chicks of the same sex that hatched at the same time from eggs of the same hen and were fed the same diet. After one week of life, their weights were recorded as 45g, 40g, 35g, 33g, and 30g. The question wants us to identify what this is an example of. The correct answer to this question is option C: variation. This is because the weights of the five chicks varied despite being of the same sex, hatched from the same hen, and fed the same diet. Variation is the differences that exist between individuals of the same species. This variation can be caused by genetic factors, environmental factors or a combination of both. In this case, the variation in weight could be due to genetic differences between the chicks or due to differences in the way they responded to the environment, or a combination of both. It is important to note that variation is a natural occurrence in living organisms and is essential for evolution to occur. To learn more about variation and factors that influence it, please read the relevant sections of the recommended textbooks.

Correct Answer: C. cell

Correct Answer: C. uses DNA to synthesize enzymes which are used in cell metabolism

Correct Answer: D. typhoid and cholera

Correct Answer: C. erythrocytes

Correct Answer: D) Food and other needs are abundant

Explanation

This question is asking which statement is not associated with the theory of natural selection. Natural selection is a process where organisms that are better adapted to their environment have a better chance of surviving and reproducing. The options provided are: Option A: there is a struggle for existence. Option B: there is a competition among offspring. Option C: the weaker offspring are eliminated. Option D: Food and other needs are abundant (Correct). The correct answer is option D, which states that food and other needs are abundant. This statement is not associated with the theory of natural selection because the availability of resources does not affect the process of natural selection. In natural selection, the traits that are advantageous in a particular environment are selected for and passed down to offspring. The struggle for existence, competition among offspring, and elimination of weaker offspring are all associated with natural selection as they are factors that affect the survival and reproduction of organisms. It is important to note that natural selection is not the only mechanism of evolution. Other mechanisms include genetic drift, mutation, and gene flow. These mechanisms can also affect the traits and characteristics of populations over time. In summary, the statement that is not associated with the theory of natural selection is option D, which states that food and other needs are abundant. To learn more about this, please read the relevant sections of the recommended textbooks.

Correct Answer: B. 29%

Explanation

This question is designed to catch a) students who are not reading the question carefully, and b) students unsure of which nucleotides pair with which. The correct answer is 29%, because cytosine pairs with guanine in a 1:1 ratio. If you answered 21%, then you likely thought the question was more complex than it was.

Correct Answer: D. Borgu Game Reserve in Niger State

Correct Answer: B) phenotype

Explanation

An organism's physical observable characteristics are referred to as its phenotype. This includes traits such as eye color, hair color, height, and other physical features that can be seen or measured. The phenotype is determined by both genetic and environmental factors. Genes provide instructions for the development of an organism's physical traits, but the expression of those genes can be influenced by environmental factors such as nutrition, temperature, and exposure to toxins. In contrast, an organism's genotype refers to its underlying genetic makeup, which includes all of its genes, whether or not they are expressed. Alleles are different versions of the same gene, while a locus is the specific location of a gene on a chromosome. Therefore, the correct answer to this question is option B, phenotype, as it refers specifically to an organism's physical observable characteristics.

Correct Answer: C. lV