Cancer is unchecked cell growth. Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor.
A stroke is a kind of vascular brain injury ischemic in origin meaning there is decreased blood flow in one or more parts of the brain, most commonly caused by narrowing of arteries. The primary motor area is located in the frontal lobe, specifically the precentral gyrus or Brodmann area 4. Since the patient has lost motor activity on his right side of the body, then the more specific answer is the stroke is located in the left (contralateral because of decussation) frontal lobe, precentral gyrus.
The morphology is an example of convergent evolution.
Convergent evolution refers to the observation that unrelated species can evolve independently to present similar characteristics. The result is that species with different lineage evolve similar structures, forms, organs or in general adaptations. An example could be the fact that insects, bats and birds (even though not related) have similar structures in order to achieve flight.
The correct answer is option (A) Variation in the strawberry plants.
When the effect of fertilizer on the growth of two strawberry plants is tested, unavoidable source of experimental error is the variation in the strawberry plants. Variation refers to the deviation or differences from the normal plant which can be due to genetic variation. It is due to change in the DNA sequence. If any one of the two plants being tested show variation, the rate of metabolism differs and changes the growth pattern of the plant. The rate of absorption of water and nutrients is effected which brings change in the growth of the plant and causes an error in the experiment and the result.
