Answer: Thanks for the tips.
Explanation:
Question: Jezelyn needs to create a project that shows reproductive isolation in action and decides to make a video. Which of the following would make the best project?
a video that shows a large river that has penguin populations on both sides
a video that shows penguin species that have different mating dances a video that shows
a penguin that is laying eggs a video that shows penguins in a tidal pool and an open ocean
Answer:
The right option is a video that shows penguin species that have different mating dances.
Explanation:
Reproductive isolation is the inability of animals of closely-related species to interbreed with one another successfully as a result of various differences which can be ecological, behavioral, psychological, or genetic. From the question given above, the difference in the mating dances of the penguin species will not allow the animals to unite and mate. This condition describes reproductive isolation. Reproductive isolation is caused by mating differences, sterility or environmental barriers that eventually lead to the adaptive splitting into two species. However, reproductive isolation is not sufficient but internal barriers to gene flow are required for speciation to evolve.
Superantigens cause the stimulation of T cells to overproduce cytokines.
- Some pathogens in an unusual way take over the immune system and mislead it by interfering in the adaptive immune system.
- Instead of processing by APC (Antigen Presenting Cells), superantigen is directly bonded to MHC-II (Major histocompatibility complex) and TCR (T cell receptor) for a longer period than normal.
- As a result, about 20% of T cells are stimulated to produce cytokines such as interleukin-2 (IL-2), interferon-γ (INF-γ), and tumor necrosis factor α (TNF-α) known as Cytokine storm. Thereby, affected individuals experience some adverse symptoms like toxic shock syndrome and rheumatic fever.
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Answer:
Central canal
Explanation:
running through the osteon
central canal or haversian canal,contains blood vessels,nerves and lymphatic vessels.
The linear sequence that passes energy from one organism to another is called the food chain. The energy is transferred starting from the Sun which is necessary for the plant's photosynthesis then move towards animals consuming plants as food. This is usually followed by humans eating animals like pigs and chickens for food.
