Astudent compared the chemical composition of soil in a certain area with the bedrock beneath it. she found that the chemical compositions were different. which statement would best explain the difference in chemical composition? a. the area's rain and extreme temperatures caused the soil to develop. b. the rainwater washed iron oxide from the a horizon to the d horizon. c. the soil is all that is left of a different kind of rock that weathered away. d. the soil layers were mature because a large amount of time had passed

Option (A)

Explanation:

The factors namely the temperature and rainfall plays a very significant role in maintaining the quality of the soil. A comparatively warmer temperature along with abundance of rainfall helps the soil to gain nutrients and increases its fertility. But a cooler temperature with lesser amount of rainfall does not provide the necessary elements to the soil. As a result of which the soil loses its fertility. In nature, these two factors occurs simultaneously, that controls the chemical composition of the soil.

Thus, the correct answer is option (A).

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

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