Correct Answer: D. competition for food and space

Correct Answer: C) Gills

Explanation

Tadpoles are the larval form of frogs and they undergo metamorphosis to become adult frogs. Respiration is the process of taking in oxygen and releasing carbon dioxide. The question is asking how tadpoles respire. The options given are lungs, nostrils, gills, spiracles, and siphon. Lungs are organs used for breathing air, while nostrils are openings in the nose used for breathing. Spiracles are openings on the body of certain insects used for breathing air. Siphons are tube-like structures used for drawing in water. The correct answer is gills. Tadpoles respire by absorbing oxygen from the water through their gills and releasing carbon dioxide. Gills are specialized organs that are used for breathing underwater. They are found in many aquatic animals, including fish and amphibians like tadpoles. It is important to note that as tadpoles metamorphose into adult frogs, they develop lungs and begin to breathe air. This allows them to live both on land and in water. In summary, tadpoles respire with gills, which are specialized organs that allow them to breathe underwater. As they metamorphose into adult frogs, they develop lungs and can breathe both on land and in water.

Correct Answer: C. Photosynthesis

Correct Answer: C) mutation

Explanation

A sudden change that occurs in a gene or genes is referred to as a mutation. Mutations can occur spontaneously or be induced by environmental factors such as radiation or chemicals. Mutations can be harmful, beneficial or have no effect at all on an organism's phenotype. Harmful mutations can lead to genetic disorders while beneficial mutations can contribute to the evolution of a species. Mutations are important because they are the source of genetic variation that drives evolution. Fertilization, variation and heredity are not appropriate terms to describe a sudden change in a gene or genes.

Correct Answer: D) cytokinesis

Explanation

Meiosis is a type of cell division that produces four daughter cells, each with half the number of chromosomes as the parent cell. These daughter cells are used in sexual reproduction and have genetic variation different from the parent cell. In this question, you are asked to identify the feature that is not unique to meiosis. Option A, synapsis, is a unique feature of meiosis. It is the pairing of homologous chromosomes during prophase I of meiosis. Homologous chromosomes are pairs of chromosomes that are similar in size, shape, and carry genes for the same traits. During synapsis, the chromosomes exchange genetic information, leading to genetic diversity. Option B, homologous recombination, is also a unique feature of meiosis. It is the process by which homologous chromosomes exchange segments of DNA during prophase I. This process leads to genetic variation and is important for the proper segregation of chromosomes during meiosis. Option C, reduction division, is also unique to meiosis. It is the first division in meiosis and separates homologous chromosomes, reducing the number of chromosomes in each daughter cell to haploid (half the number of chromosomes in the parent cell). Option D, cytokinesis, is not a unique feature of meiosis. Cytokinesis is the division of the cytoplasm that occurs after the separation of the chromosomes during cell division. It occurs in both mitosis and meiosis. Therefore, the correct answer is Option D, cytokinesis, as it is not a unique feature of meiosis and occurs in both mitosis and meiosis.

Correct Answer: A. father's sex cell

Correct Answer: D. hair

Correct Answer: C. commensalism

Correct Answer: C. viruses

Correct Answer: B. Q