<span>The
answer is D. So as to take the shortest time to react to stimuli, most sensory neurons
are looped through the spinal cord to motor neurons. Following a reflex action,
the signal is later passed to the brain, from the spinal cord, for the signal
to be analyzed. A reflex arc is divided into
somatic and autonomic reflex arcs. The former is connected to outer muscles
while the later to inner organs. </span>
Spore production is the answer
Answer:
The correct answer is A) There are more species that have the ability to travel 5 kilometers than can travel 15 kilometers.
Explanation:
The ecologists MacArthur and Wilson took the term island biogeography theory to refer to the predictions about the number of species that could be inhabiting on an island.
Island biogeography theory establishes that the two factors that affect species richness in natural communities on an island are <u>the distance from the mainland and the size of the island. </u>
At the same time, these factors affect inmigration and extinction rates. According to the theory, the inmigration rate depends on the distance between the island and the mainland, of the number of species that keep living on the mainland and not stablishing on the island and the <u><em>probabilities that the species can move from the continent to the island</em></u>. Islands that are closer to the continent have higher possibilities of receiving immigrants than those islands that are located farther from the mainland. This is the effect of distance.
The extinction rate depends on the area of the island, the number of species living on it and the extinction probability of these species. The effect of size is reflected in the relation between island size and species diversity. In smaller islands, the probability of extinction is higher than in bigger islands. Bigger islands can have more species than smaller ones.
In the case of two islands of the same size and different distance to the mainland, both of them will have the same extinction rate, but the one closer to the continent will have a higher immigration rate, and so, a higher amount of species. The S value will be higher on the island closer to the continent.
Answer:
Fresh water represents only a small part of the water resources of the Earth. the fishes present in these ecosystem have high economical values and are beneficial to mankind. The evolution of these fishes is important because it will allow genetic varieties to arise in these fishes. Hence, these fishes will be able to survive and reproduce. Also, some of these fishes might adapt to live in salty environments in the course of evolution.
Negative effect of mechanization of farming is increased fuel costs