Red-eyed tree frog eggs can hatch up to two days earlier than average when they detect vibrations. However, if they hatch more t
han two days earlier than expected due to vibrations, the embryos are typically not developed enough to survive outside of the egg. Explain how natural selection inhibited frog eggs from hatching any earlier than two days before expected hatching. Explain your answer in 1–2 sentences.
Hatching is an essential embryo behavior that mediates the transition between two distinct stages of life, in the egg and post-hatching environments, when developing animals are exposed to different risks and opportunities. Variation in either of these environments can affect when is the best time to hatch. Environmentally cued hatching allows embryos to respond adaptively to their local environment by altering the timing of their hatching. Therefore, the vibrations can make the frog eggs hatch before time. So if it hatches more then two days early the frog will not be able to live and will die.
Extensively drug-resistant
tuberculosis is a form of tuberculosis which is caused by bacteria that are
resistant to some of the most effective anti-TB drugs such as isoniazid and
rifampin. This form of tuberculosis occurs due to an individual’s mismanagement
of multidrug-resistant TB. Treatment for extensively resistant TB would include
medication with at least two drugs to which the TB is susceptible.
Answer: There are a total of 22 bones in the skull. The skull is not only made up of bones but also cartilages and ligaments. The facial skeleton does not include the teeth and the cartilage of the nose. The skull contains foramina or canals scattered throughout the skull bones.
