Most terrestrial animals crawl. Snails and slugs crawl on a specialized foot. Newts, salamanders and lizards crawl too. Frogs and toads crawls when they are not hopping and so do insects. Flies, moths and bees crawls when not in flight. Some animals crawls at some stages of life but not others - for example baby humans crawl as do caterpillars before they turn into butterflies!
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I believe the correct answer is A. Diffusion happens continually until equilibrium is attained. It moves from a higher concentration to a lower concentration. The driving force of such process is the concentration gradient between two systems. In order to be in equilibrium, the concentration at any point of a mixture should be equal.
A blood pressure reading of 120/80 is determined by using a sphygmomanometer to measure blood pressure in the veins. The <span>top number is the systolic pressure and the bottom number is the diastolic pressure. </span>