Protists are a collection formed up of protozoa, unicellular algae, and fungus forms. We will focus on the being part of this society: the protozoa (proto = first, zoa = beings). Protozoa are the earliest discovered collection of heterotrophic living that utilize and modify complicated meal particles into power. Although protozoans are only made up of a single cell, these organisms control to perform all the necessary responsibilities of life. The protozoa are split into four principal associations: the ciliates, the flagellates, the heliozoans, and the amoebas.
Protists are the kingdom that includes unicellular organisms. These organisms are eukaryotic in nature which means that it has a well-defined nucleus. They may be present in colonies or biofilm. But they re self-sufficient. Since the time of formation of these organisms, they have constantly undergone evolution forming a more complex type of organisms.
<u>The first protists appeared during the proterozoic age at about 1.8-1.5 billion years back</u>.
Hence <u>the most appropriate answer is 1.5 billion years ago i.e option (C)</u>
"When exposed to antibiotics, most bacteria in a population die but some survive and live to reproduce" is the one example that <span>illustrates Darwin's main contribution to the theory of evolution. The correct option among all the options that are given in the question is the third option or option "C". I hope it helps you.</span>
The Nurse should say that during the pregnancy the breast feels pain and also abdominal pain. This all is general pain that happens to every woman in their pregnancy state.
<u>Explanation:</u>
Involution is the process that takes place during pregnancy time. It makes the uterus comfortable for childbirth.
As it produces a hormone called oxytocin. The mammary glands are becoming size for the production of milk.
Which is required for the baby. Pain also occurs in the back and also in the legs.
