<span>Light microscopy is great for small labs and general use, as the microscope is lightweight, usually portable, and relatively inexpensive.</span>
Darwin's proposed mechanism for evolution is natural selection. Natural selection allows species to respond to their surroundings through time, or to become progressively excellently-suited. Natural selection is environmentally based and involves established heritable variation within a population.
They lead to changes in species over time:
- Darwin suggested species will evolve over time, new species originate from pre-existing species, and all species share a common ancestor with each other.
- In this framework each organism has its own special set of heritable i.e genetic variations from the common ancestor that have slowly developed over very longer periods of time.
- Parroted branching activities that isolate new species from a common ancestor create a multi-level tree that connects all living organisms.
Strep throat and bacterial pneumonia are examples of
The correct answer is a. bacterial communicable diseases.
Strep throat is a bacterial infection which has symptoms such as sore and scratchy throat. The causative agent of strep throat is <em>Streptococcus pyogenes </em>and gets spread by contact by the secretions of the respiratory tract of the infected person if the person sneezes or coughs.
The bacterial pneumonia is commonly caused by <em>Streptococcus pneumoniae. </em>The bacterial pneumonia is a community acquired pneumonia. The most common way it is caused when the bacteria aspirates from the oral cavity or by breathing infected air droplets having pneumonia. The bacteria can enter the bloodstream and deposits in the lungs causing pneumonia.
If a doctor wanted to find out the number of white blood cells in a patient's blood, he or she would order a(n)
The correct answer is d. complete blood count.
White blood cell count test is used to measure of the white blood cells in the patient's body. This test is included in the complete blood count test. There are different types of white blood cells present in the body and each of it has a specific percentage .
1. natural selection acts on existing traits because you can not evolve into something you didn't have
2. original structures evolve to accomplish new function in order to survive
I believe the answers are A. C. D.
