Sperm DNA damage has been associated with high levels of reactive oxygen species.
High levels of which have been detected in the semen of 25% of infertile men.
Answer:
False
Explanation:
The function of ACTH (adrenocorticotropic hormone) is to regulate levels of the steroid hormone <em>cortisol</em>, which released from the adrenal gland. It is a <em>tropic</em><em> </em><em>hormone</em><em>,</em><em> </em>so it causes no direct effects
Answer: a. the lowest trophic level
Explanation:
The keystone species is the one on which the entire ecosystem depends upon. It maintains a balance in the ecosystem. If this species is removed the ecosystem will drastically change. The members of the keystone species are abundantly available at the lowest trophic level. This will help in making a balance in a community or ecosystem. If some members die others will be available to survive others.
Answer:
Evidence
Explanation: You would have more evidence to prove a point, which makes an idea valid.
<u>Answer</u>:
Science is not limited to the laboratory because it has done in a laboratory to study the physical, chemical and biological aspects of the natural system. It mean that science presents everywhere and happening at all times. It also mean that anyone can become a scientist and they can conduct the experiments with the data and a hypothesis.
<u>Explanation</u>:
Science is the study of the physical, chemical, biological, and mathematical study of nature. The science is studied in laboratory conditions to validate the various reaction and principles occurring in natural systems.
In a laboratory, small system or model is made to study the particular aspect of a large system. Thereby, science in the laboratory helps to find out the science of the actual world. Various principles, machines and designs are inspired by the natural systems.
