-They are multicellular organisms which do not possess chlorophyll.
-They are eukaryotic organisms.
-Cell wall is absent.
-Mode of nutrition is heterotrophic i.e. they depend on other organisms for food.
1. Balance
2. Cell division
This man is presenting with signs/symptoms of an inferior wall M.I. (myocardial infarction), a heart attack. He needs to be started on IV fluids with morphine, oxygen, nitroglycerin, and aspirin. However, it is imperative that before administering nitro/nitrates, he denies having taken any sexual meds for erectile dysfunction (e.g. Viagra) within the past 24 hours. That combined with nitrates can lead to a life-threatening irreversible crash of central blood pressure around the heart.
natural selection selects from among heritable differences between.
if no such differences exist, because all differences are due to the environment and thus not heritable.
Answer:
Open circulatory systems are advantageous to some animals because they use less metabolic energy.
Explanation:
Open circulatory systems are also known as lagoon circulatory systems. In this systems the blood is not necessarily always inside the blood vessels; It leaves the heart and will directly irrigate the organs and then return by other means or mechanisms.
So that it can be understood more easily, it is necessary to think about this system acting in organisms much smaller and less complex than mammals or any other vertebrate of greater size. As this animals doesn't have a great size, they need to use less metabolic energy than more developed organisms, so this system allows them to save metabolic energy to be used in other living functions.
