The aorta, which arises directly from the heart
Answer:
Biologists measure the number of trophic levels in an ecosystem so as to check its stability and health.
Explanation:
Trophic levels are the feeding position in a food chain such as primary producers, consumers, etc. They are positions that an organisms occupies in a food chain (series of steps in which organisms transfer energy by eating or being eaten);- what it eats and what eats it.
Theoretically there is no any limit to the number of trophic levels in a food chain or number of organisms that live on each level.
Explanation:
Carbon dioxide (CO2) is an important heat-trapping (greenhouse) gas, which is released through human activities such as deforestation and burning fossil fuels, as well as natural processes such as respiration and volcanic eruptions.
There are four postulates of Darwin in which individual of species are not identical, traits are eased from one generation to the other and more offspring are born than that can survive. survivor of the competition for resources will reproduce only.
The four principle or postulates of Darwin are - variation , inheritance , selection and time. these all are considered the evolutionary component natural selection mechanism.
One is origin species by means of naturally selective mechanism, then preserve in the struggle of race of life.Darwin selection is mainly depends on the environment and heritable variations.All species of organisms which arise through natural selection of survive and reproduce.
To learn more about Darwin here
brainly.com/question/27812304
#SPJ4
Answer: RadioImmunoassay
Explanation:
RadioImmunoassay is a technique used in the measurement and comparison of hormones. It helps to identify difference in the hormone concentration of various species. It makes use of Anti-bodies directed against the hormones and the radio-labelled forms of hormones. A standard curve that contains a known amount of hormone is then use to compare and calculate measurements of the new hormones.
