An operculum covers and protects the gills.
Explanation:
An operculum is a flexible bony type of plate which protects the sensitive gills. When water is inhaled through the mouth it moves over the gills and is exhaled from below the operculum ( gill cover). gills remove oxygen that is present in the water and diffuse carbon dioxide from fish's body. Some fishes have spines which are located on the opiculum( gill cover) which acts as a defense mechanism to secure them from the predators.
Answer:
A
Explanation:
Examples of mass wasting are slides, falls, creeps, and flows. Mass wasting processes are easily observable because they happen fast and suddenly and the changes are vividly evident in very short bit of time. However, other methods of erosion such as mechanical and physical weathering occur very slowly and it would take many years for the changes associated wth their proceses to be vivid to the naked eye.
A genome is an organisms complete set of DNA. DNA is what makes you, you. It provides the "blueprints" for what proteins need to be created in order to make each organism. Thus, the human genome is like the blueprints of a house as they are both the starting point for each new creation.
Answer:
A promoter is a region of DNA where transcription of a gene is initiated.
Explanation:
Promoters are a vital component of expression vectors because they control the binding of RNA polymerase to DNA.
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