I would say that the kidneys purpose is to filter waste material from the blood primarily to remove waste fluid from the blood and leave just the right of salt and minerals in the blood and remove the waste fluid which is known as urine.
Pollination cycles do not really have any direct effect with the soil. Releasing moisture from leaves does replenish some water needed in the soil that is cycled back through the transport systems of plants but does not hold back soil. Photosynthetic activities only draw up nutrients, minerals, and water from the soil through roots.
Therefore, the often elaborate ROOT SYSTEMS are the answer. This is because the roots hold the plants in the ground (soil) and by this, the plants prevent natural disasters, artificial actions, and/or excess water to wash away soil. The roots help to reinforce the soil and hold it together.
The actual answer (sorry for the late reply, but this is for the rest of the people coming afterwards) would actually be B) Switch primitive reptile with primitive insect. Insects came before any reptiles.
The genetic base of the shape of orchid is very complex.
Mendelian traits are described as simple traits determined by one gene. The different alleles of the gene contribute to the difference in the trait. This is true for some traits in plants, animals including humans and other organisms, but not for the shape of orchids.
The shape of orchid flowers is determined by the ABCDE group of genes that are responsible for the body plan in plants. These genes are the equivalent of HOX genes of animals.
The protein products of different genes of the ABCDE group interact with each other in complex ways creating different shapes of orchids.
Gymnosperms lack fruits so angiosperms are more advanced than them.
Compared to gymnosperms, flowering plants may thrive in a wider range of settings. Compared to gymnosperms, flowering plants mature more quickly and generate more seeds. Additionally, angiosperms have more complex and specialized woody tissues. Gymnosperms lack flowers and fruits and have unenclosed or coverless seeds on the surface of scales or leaves, in contrast to angiosperms, generally known as flowering plants, which have seeds that are contained within an ovary (typically a fruit).
Learn more about Gymnosperms here-
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