A useful index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time.
Answer: Option D.
The lub heart sound is due to the closing of atrioventricular valves.
Explanation:
Heart sounds are noises that are generated from beatings from heart and from blood that flows through it. The heart sound reflect the turbulence generated when the heart valves snap shut. Lub is the first heart sound also called S1 and it is caused by turbulence and closure of the atrioventricular valves(mitral and triscupid valves) at the start of systole. The second sound is the dub sound which caused by the closing of aortic and pulmonic valves at the end of systole.
Answer: Polymerization
Explanation: The linking up of monomers is called polymerization. It is the long chains that give polymers their unique properties.
Answer:
Term Meaning
Symbiosis Interspecific interaction in which two species live together in a long-term, intimate association
Mutualism A symbiotic relationship between two species in which both partners benefit
Commensalism A symbiotic relationship between two species in which one benefits and the other is unaffected
Answer:
cellular respiration
Explanation:
energy is produced during cellular respiration.
