Need "an observation about the the world"

The factor (s) that determine the duration of a twitch in various types of fibers is the speed of the A. removal of Ca2 + ions from the sarcoplasm only. B. hydrolysis of ATP only. C. movement of Na + across their membranes only. D.

Why do people age / body change

Which phrase describes estuaries? are made of fresh water only are areas where rivers flow into lakes are homes to unique plants and animals are places where all of Virginia's water drains

Why are the leaves of many plants broad and flat? A. To prevent water loss from transportation B. To transport nutrients through the plant C. To obtain energy by breaking bonds in glucose D. To capture light energy used for photosynthesis

While walking home on a dark night, Joanna saw a bright light in the sky and concluded that it must have been a spaceship from another planet.

Which characteristic of a protein may change during a dna mutation

Which system consists of the body's outer covering?

Answer of layla, age 4, breaks out in hives whenever she has eaten too many strawberries or oranges. she will occasionally accept a small serving of applesauce or a few bites of banana but few other fruits.

Which list correctly describes the three domain systems for classifying organisms A. bacteria, archaea, eukarya B. Darwin, Linnaeus, lamarck C. animalia, planter, fungi D. None of the above

Elephant seals are abundant in their population size but they have low genetic diversity within their species due to overhunting by humans in 1890s. Why might the survival of this species be threatened in the future?