Answer:
the moon and the sun line up above earth and sometimes creates eclipses.
Explanation:
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Cataloguing in biology refers to the listing of various species. Species found in a specific area will have a different catalogue than those in a location with opposing conditions.
About 2/3 of all body fluid is within cells and intracellular compartments. <span>Body fluids (or biofluids) are This is divided between intracellular fluid (ICF) and extracellular fluid (ECF) in a 2 : 1 ratio. Intracellular fluid is within cells and intracellular compartments, while extracellular includes the interstitial fluid (between cells) and the vascular fluid (blood).</span>
Answer:
The xylem vessels and the phloem sieve tubes are connected end to end to transport the water and the food respectively to long distances in a plant. Their end plates are perforated to allow the easy passage of substances from one vessel and the sieve tubes.
Answer:
C. Mutation.
Explanation:
The mutation is the source of all genetic variation. There are two types of mutations. One is the natural mutation, and another is the artificial mutation. The natural mutation occurs due to the environmental cause, and humans using various mutagens do artificial mutations.
These two types of mutations always bring variation in any organism. This variation can be positive or can be negative too. Natural mutation is not possible to control so that anything can happen. Either positive or negative changes can occur. But in the case of artificial mutation, in 90% cases, positive results come in genetic variation.
