Do you think a feature of early embryology, such as the fate of the blastopore, is a good basis for classifying animals? Explain your answer. Although they are the most abundant class of echinoderms, comparatively little is known about ophiuroids, Why do you suppose that is the case? In which class of cnidarians is Aristotle's Lantern present? What is its function? How do hemichordates differ from chordates? How is feeding similar in urochordates and cephalochordates? How is it different?

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

the answer is admiramos

the rule for verbs is whoever you are referring to (in this case 'nosotros'), you need to change the ending of the word.

nosotros - amos

yo - o

tu - as

el, ella, usted - a

ellos, ellas, ustedes - an

(examples: nosotros bailamos (instead of bailar) or yo hablo (instead of habla)