Complex molecules are made up of other elements bonded with carbon. Carbon is able to bond with other molecules so easily because it has four valence electrons.
Answer: A. The genes encode resistance to antibiotics.
D. The genes are carried on plasmids
F. The "clock"genes are highly mobile between species.
Explanation:
Molecular clock is a tool that is used to calculate the time of the evolutionary events. These are the gene sequences that are used to determine the evolutionary distance between the new and primitive organisms developed on earth. It also measures the random changes just like mutation. Thus the molecular clock is also called as the gene clock or evolutionary clock.
The accuracy of the molecular clock can be increased by the genes that encode for a resistance against the antibiotics, the genes that are carried on the plasmids and the clock genes which are highly mobile among the species.
There is absorption of carbon dioxide
by the oceans through physicochemical (air-sea surface exchange) and biological
processes. During physicochemical process, molecules of CO2 get into the ocean
by diffusing into the sea surface waters and dissolving. Various factors such
as wind, sea surface mixing, concentrations of CO2, and the temperature of the
water influences the amount of CO2 that diffuses and dissolves in the ocean
surface water. Also, during biological processes, dead cells, shells and other
parts of dead organisms get decayed and releases carbon dioxide at the bottom
of the water.
Answer:
true
Explanation:
solar energy can be converted into electrical energy thru solar panels
Answer: B. Amount of matter produced by the producers should be more than that of the consumers.
Food web defines a interconnection between different food chains and transfer of energy at each trophic level. According to the ten percent law 10% energy is lost from each trophic level. At the first trophic level there are producers. Producers occupy the only one level in the trophic levels the rest is occupied by consumers this shows the category of consumer is more than producer. Therefore, for successful food web food availability should be more at initial trophic level hence amount of matter produced by the producers should be more than that of the consumer.
