Answer:
Option (B)
Explanation:
The pelagic sediments usually refer to those sediments that are found at the deep ocean floor. These are clay that is mostly brownish or reddish in color. The sediments are usually very fine-grained and are deposited at a very slow rate, in many parts of the abyssal plain. These sediments are comprised of less than 30% of the biogenous materials such as the calcareous as well as siliceous particles. There occurs a lesser proportion of biogenous sediments, comprising the organic matter. Some of the examples of pelagic sediments include oozes, carbonate sediments.
Thus, the correct answer is option (B).
Answer:
Vestigial organs
Explanation:
Vestigial organs/ structures are those parts of the body that have become redundant, weakened, or useless to the body as a result of prolonged inactiveness.
According to Charles Darwin's theory of evolution, he explains that parts of the body that are not used quite often do not develop any further, and as generations of offspring come and go, such parts become useless to the organism. This is the law of use/misuse of parts.
This is what happened to the whales. Over the years, the whales must have discovered that the legs were useless to them as they spent most of their time in the water. This led to the degeneration of such body part over thousands of generations, leaving them with just a faint trace of the hind limbs which were observed
Answer:
Koch's postulates say that microbes are present in the case of every disease and these disease-causing microbes can be isolated to grow in pure culture. He also said that this pure culture if transferred in healthy individual it will cause disease.
Chytrids contain many parasite fungus that infects amphibians and by using Koch postulate we can show that chytrid infections are responsible for the frog deaths.
First, we have to take the sample from dead diseased amphibian then this sample should be inoculated in a selective media which supports the growth of chytrid fungus and not bacteria.
Then this pure culture of fungus is transferred in a healthy amphibian. The death from chytrid infection of healthy amphibian will show that chytrid infections are responsible for the frog deaths.
The correct answer is option A , C and D
The earths material is recycled and this can be visualized from the different chain cycles such as nitrogen cycle, carbon cycle , sulphur cycle, water cycle etc. These basic components which constitute all the matter existing on earth are continuously recycled and reused. Likewise the energy obtained from sun is neither created nor destroyed; it is only converted from one form of energy to the other form. Such as heat energy obtained from sun is converted into kinetic energy when it converts water into water vapor.
Answer: Exercise causes the heart to pump blood into the circulation more efficiently as a result of more forceful and efficient myocardial contractions, increased perfusion of tissues and organs with blood, and increased oxygen delivery. Aerobic exercise trains the heart to become more efficient.
Explanation:
PLEASE MARK ME AS BRAINLIEST
