Correct Answer: D. Presence of vascular system

Correct Answer: D. tropical rain forest

Correct Answer: B. attract mates

Correct Answer: A. cortex

Correct Answer: C) ventricles pump blood to distant organs

Explanation

The question is asking why the ventricles of the mammalian heart are more muscular than the auricles. The options are: A) auricles have smaller capacity, B) ventricles are larger in size, C) ventricles pump blood to distant organs (which is the correct answer), and D) ventricles receive more blood. To answer the question, we need to understand the function of the heart. The heart is a muscular organ that pumps blood throughout the body. It is made up of four chambers: the left and right atria (also known as auricles) and the left and right ventricles. The atria receive blood from the body and lungs, while the ventricles pump blood out of the heart to the rest of the body. In the given question, we are asked why the ventricles are more muscular than the auricles. The correct answer is option C: ventricles pump blood to distant organs. This means that the ventricles have to work harder than the auricles to pump blood to various parts of the body. As a result, the ventricles are more muscular to handle the extra workload. Option A (auricles have smaller capacity) and option B (ventricles are larger in size) do not fully explain why the ventricles are more muscular. Option D (ventricles receive more blood) is also not a complete explanation, as the amount of blood received does not necessarily correlate with muscle mass. In summary, the ventricles of the mammalian heart are more muscular than the auricles because they have to pump blood to distant organs and therefore need to work harder.

Correct Answer: C. They help reactions occur at a rate compatible with that necessary for sustenance of life.

Explanation

An enzymes function is to speed up chemical reactions by lowering the activation energy. If our bodies did not have enzymes, the reactions would take place, but too slowly for our cells to adequately function.

Correct Answer: D. Stickyjuice

Correct Answer: B. in open fields

Correct Answer: B. no gills

Correct Answer: D) Antheridium

Explanation

This Biology question is asking which of the options given is not part of the whorls of a flower. Whorls are the circular or spiral arrangements of flower parts. The options provided are calyx, corolla, androecium, antheridium, and gynoecium. Calyx and corolla are parts of the outer whorl of a flower and are collectively called the perianth. The calyx is the outermost whorl of the flower and is made up of sepals while the corolla is the second whorl and is composed of petals. Both the calyx and corolla are involved in protecting the reproductive parts of the flower. Androecium and gynoecium are parts of the inner whorls of a flower. The androecium is the male reproductive part of the flower and is composed of stamens which have an anther that produces pollen. The gynoecium is the female reproductive part of the flower and is made up of the pistil which has the ovary, style, and stigma. Antheridium, on the other hand, is not part of the whorls of a flower. Antheridium is a structure found in some lower plants like algae, mosses, and ferns. It is the male sex organ that produces and releases sperm. Therefore, option D is correct. In summary, the whorls of a flower are made up of calyx, corolla, androecium, and gynoecium. Antheridium is not part of the whorls of a flower, as it is a reproductive structure found in some lower plants.