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Answer:
a common ancestor that used these structures to perform one or more specific functions
Explanation:
A vestigial structure is an organ that has no obvious function in an organism, but it has been used by a past ancestor to perform one or more specific functions. Thus, vestigial structures have been retained in the course of evolution, but they lost their ancestral functions. Vestigial structures/organs can be detrimental for the organism because it is required energy to maintain them and they may suffer diseases (e.g., cancer). Some well-known examples of vestigial organs/structures include, among others, the wings of ostriches and cormorants, the human appendix, etc.
In simple words, the forest can be stated as the opaque growth of tree covering the large area and it has lots of uses.
<u>Explanation:</u>
- Forest help us to maintain the ecological balance. In earlier days, forest acts as a source of the medicine.
- It maintains the land and prevents soil erosion. The forest produces an enormous amount of oxygen and plays a role in climatic change.
- It plays a role in ecological functions and social and cultural benefits. The largest forest in the world is the Amazon forest which covers 2.2 million square miles.
Answer:
A) Enzymes and chemical catalysts both affect the rate but not the equilibrium constant of a chemical reaction. Reactions proceed downhill energetically, in accord with the Second Law of Thermodynamics. Catalysts merely reduce the time that a thermodynamically favored reaction requires to reach equilibrium. Remember that the Second Law of Thermodynamics tells whether a reaction can occur but not how fast it occurs.
I thinks it’s D but not sure