Answer: Savannas
Explanation: Savannas are generally found between the desert biome and the rainforest biome. They are mostly located near the equator. The largest savanna is located in Africa. Nearly half of the continent of Africa is covered with savanna grasslands.
Answer:
Plants perform photosynthesis because it generates the food and energy they need for growth and cellular respiration. It is important to note that not all plants photosynthesize. Some are parasites and simply attach themselves to other plants and feed from them.
Answer:
They increase the levels of catecholamines—a family of brain chemicals that includes dopamine.
Explanation:
Stimulants are a class of drugs that “stimulate” the body's central nervous system, which includes the brain and spinal cord. They increase the levels of catecholamines—a family of brain chemicals that includes dopamine. These chemicals are used in the brain processes to signal reward and motivation.
If a mutation occurs in the DNA let's say a point mutation only one of the base pairs will be different. The codon will be different so a different amino acid will be synthesized. Amino acids have different radicals with different functional group. Those radicals that differ from amino acid to amino acid determine the shape and function of the protein. Therefore a mutated gene will cause the synthesis of a protein with an altered shape and function. A good example is sickle cell disease. Where glutamic acid is replaced with valine and the beta chain of hemoglobin has a deformed shape and has an altered function(carries less oxygen).
Answer:
Thalamus and hypothalamus
Explanation:
The anterior region of hypothalamus known as supraotic region secretes several hormones that control both the physical and emotional stress and responses. For instance, CRH hormone triggers the release of cortisol which is an important stress hormone. The posterior region of hypothalamus known as mammillary region controls the memory function.
Thalamus on the other hand is responsible for relaying sensory signals and thus regulates alertness and sleep.
Thus, both Thalamus and hypothalamus are mainly responsible for coordinating internal and external responses