Answer:
The correct answer is - Evolutionary species concept
Explanation:
The given definition is the definition of the evolutionary species concept or the lineage species concept that can be understood by the following -
Evolutionary species concept depicts that "a species is a single lineage of ancestor-descendant populations which keeps up its character from other such lineages and which has its own evolutionary inclinations and historical fate.”
Thus, the correct answer is - Evolutionary species concept
The differences between a plant and algae are:
- lack of vascular tissue in algae.
- different types of chlorophyll used in chloroplasts
<span>- bsence of "root, stem, leaf" structure
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In the lower part of Earth's crust and in the upper part of the mantle.
Explanation:
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.
