The question is incomplete. The complete question is:
Question: Imagine a population of Galápagos finches that vary for bill size. If the population mean is near the optimum size for eating the seeds found on the island, what would we expect to occur if their main seed resource goes extinct, and another plant with much larger seeds replaces it?
a) Stabilizing selection maintaining the population average
.
b) Directional selection increasing bill size towards a new optimum
.
c) Extinction of the new plant as finches each all its seeds
.
d) Disruptive selection increasing phenotypic variance for bill size
.
e) Correlational selection between seed size and bill size.
Answer:
b) Directional selection increasing bill size towards a new optimum
.
Explanation:
Directional selection occurs when there is a change in the environmental conditions and includes gradual replacement of one phenotype with another. The changes in the environmental conditions favor one of the extreme phenotypes.
According to the given information, there is a change in the seed size available as food for the finches. The extinction of the main seed and availability of larger seeds would favor the bill size that allows the finches to feed on the larger seeds. Directional selection would favor this beneficial bill size and gradually, the bill size of the population would change in favor of the new optimum bill size.
Answer:
Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds, Three main ingredients are required for photosynthesis: water, carbon dioxide, and light. Plants use light energy from the sun to convert six water molecules (6 H2O) and six carbon dioxide molecules (6 CO2) into a molecule of glucose and six molecules of oxygen, Carbohydrates(glucose) and Oxygen is the end product.
Answer:
Similarities: both are chemical messengers, both can have (but don't necessarily have) similar structures (made from amino acids), both can be produced by the central nervous system (hypothalamus produces some hormones), certain molecules can act as both hormones and neurotransmitters (example: norepinephrine).
Differences: neurotransmitters are released by neurons across a synaptic gap, have very short distances to travel, and act very quickly on the neighboring cell. Hormones are released by glands and often have to travel longer distances, which means that they are slower-acting. Also, hormones are typically used for regulation (negative feedback) while neurotransmitters are used for stimulation of a neighboring cell.
Explanation:
Beneficence is the practice of offering selfless help to others. Medical and health practitioners are called upon by ethicists to uphold a high degree of commitment to helping other, and refraining from causing harms to others as well as rescuing their patients if they are in dire need of their special skills in treatment and medicine. the practitioners are expected to adhere to acts that brings more benefit to people, their patient and society at large.
