Ans.
Animals are multicellular, eukaryotic organisms that belong to domain eukarya. They have cells with membrane-bound cell organelles, such as mitochondria, endoplasmic reticulum, nucleus, Golgi body, and lysosomes. In these organisms, genetic material is present inside the nucleus (known as true nucleus), which is surrounded by double-membrane system.
Thus, the correct options are:
-They contain a nucleus.
-They are eukaryotic.
-They contain membrane-bound organelles.
<span>The correct answer is a unilinear evolutionary theory.</span>
<span>According to this theory, all societies would pass through the same basic stages, although the speed of transition might vary. The unilinear theory is a social theory, whichconsidersr that Western culture was the most evolved one.</span>
Answer:
When many different species live in an environment, the environment has high<em> biodiversity</em>. If the number of predators increase in an area, the immediate effect will be a<em> unstable ecosystem (</em><em>decrease in the population of prey</em>.)
Explanation:
In ecology, biodiversity can be described as the different plants and animals which live in a habitat. If a habitat has many kind of different species, then the habitat or ecosystem will have a wide biodiversity. The wider the biodiversity, the more stable an ecosystem will be.
If the number of predators will increase then the ecosystem will become unstable. There will be more competition for resources.
Answer:
The skin is made up of four different kinds of cells which are:
Keratinocytes: They form tight junctions with the nerves of the skin.
Melanocytes: These are the pigment producing cells.
Langerhans cells: These are the immune cells of the skin.
Merkel cells: They show some sensory responses.
The blood cell is made up of different cells which are:
White- blood cells: These provide the body with immunity and helps to fight diseases. There are different types of white blood cells which perform various immune functions.
Red-blood cells: Red-blood cells are involved in the travel of oxygenated and de-oxygenated blood.
Platelets: These help in the formation of clots and to stop bleeding during an injury.
