Answer:
I believe the answer is A.
Explanation:
Species may share similar physical features because that feature was present in a common ancestor. These features are known as homologous structures.
Answers b, c, and d sound probable, but those responses of foods, habitat, and genetic mutation don't directly correlate with the theory of evolution.
For example: In option d, these organisms all most likely suffered from a genetic mutation, but the similarity of the embryos does not prove that.
Answer:
In a community, every species interact with each other. This results in the competition among them for food and habitat. The competition is more when the resources are limited and every species compete for it. Thus the efficient species will survive and the weaker one will perish. This is known as the competitive exclusion principle.
According to this principle, two species cannot live together in the same habitat and have the same niche. Niche is the resource used by individual species and it should not be shared by many species.
If the species want to coexist in a community without any competition the niche should be different. Otherwise, it leads to evolution.
Because if resources would overlap in use, the species which less dependent on the resource will be selected for evolution. If both the species is unable to evolve and rely on the same niche, then there is rigorous competition. The species which is powerful and fit exploit the resource and this leads the other species to extinction.
This competitive exclusion principle has shown in the two paramecium species - Paramacium aurelia and Paramecium caudatum. When they are grown individually in the culture medium they thrive. But when they are grown together in the same culture medium, Paramecium aurelia extinct the Paramecium caudatum for food.
Answer:
Whether or not a given isotope is radioactive is a characteristic of that particular isotope. Some isotopes are stable indefinitely, while others are radioactive and decay through a characteristic form of emission. As time passes, less and less of the radioactive isotope will be present, and the level of radioactivity decreases. An interesting and useful aspect of radioactive decay is half-life, which is the amount of time it takes for one-half of a radioactive isotope to decay. The half-life of a specific radioactive isotope is constant; it is unaffected by coTnditions and is independent of the initial amount of that isotope.
Consider the following example. Suppose we have 100.0 g of tritium (a radioactive isotope of hydrogen). It has a half-life of 12.3 y. After 12.3 y, half of the sample will have decayed from hydrogen-3 to helium-3 by emitting a beta particle, so that only 50.0 g of the original tritium remains. After another 12.3 y—making a total of 24.6 y—another half of the remaining tritium will have decayed, leaving 25.0 g of tritium. After another 12.3 y—now a total of 36.9 y—another half of the remaining tritium will have decayed, leaving 12.5 g. This sequence of events is illustrated in Figure 15.1 “Radioactive Decay”.
Explanation:
I think the first statement is true; while the second statement is false. It is true that drinking sea water would cause a rise in the osmotic pressure of the extracellular fluid because sea water will be hypertonic (salty water) to the extracellular fluid therefore water will move from the extracellular fluid osmotically creating an a rise in osmotic pressure. The whole effect won't make water leave the blood capillaries.
im going to try answering this question because my teacher dont teach me science so i think its true but if its wrong im sorry
