1 Answer. Mandira P. With the discovery of electron microscope, biologists realised that it did not make any sense to include prokaryotic world of bacteria in kingdom protista with single celled eukaryotic organisms. Hence a separate kingdom, Monera, was created.
Answer: The immune system
Explanation:
The immune system is a complex network of proteins and cells that defends the body against infection or any invasion. The human defense system in the body is actually made up of entire organs and vessel systems like the lymph vessels. The immune system is made up of organs that control the production and maturation of certain defense cells.
Initially, all living things are subjected to attack from disease causing agents. Even bacteria, so small that more than a million could fit on the head of a pin, have systems to defend against infection by viruses. This kind of protection gets more sophisticated as organisms become more complex.
Answer:
Geological events can cause drastic changes over long periods of times
Explanation:
He used these insights and stated that Geological events can cause drastic changes over long periods of time. Such changes can cause entire species to become extinct or cause drastic evolutionary physical changes to other species. This is because the environment changes and the animals living in these environments need to adapt in order to be able to survive. Some changes such as continental drift can even move species to different parts of the world where the climate is drastically different.
Answer:
Simple cell
Explanation:
Simple cells are found in primary visual cortex and are made up of large number of receptive fields from neurons and the respond to light at specific Orientation and oriented edges. The cells were discovered by Torsten Wiesel and David Hubel in the late 1950s. The simple cells respond to stimuli with some particular orientations to objects within their receptive fields. Receptive fields comprises of sensory receptors in the sensory neurons that draw out neurosonal responses when there are stimulated
Answer:
The answer is C- Lysosomes are present in both bacterial and animal cells.
Explanation:
Lysosomes contain digestive enzymes inside them, which when released break down damaged cell parts. These enzymes are <em>acidic</em> in nature and are separated from other organelles with the help of a membrane.
Lysosomes help in<em> killing bacteria and virus</em> invading the cell body. Lysosomes also take part in the process of cell death known as '<em>apoptosis</em>'. This happens only when a certain cell is beyond repair.
Lysosomes are present in plant cells, animal cells, bacterial and yeast cells.
