Carbon Dioxide is the gas that contributes most to the greenhouse effect.
Answer:
natural selection acts by differential survival and reproduction
Explanation:
According to the evolutionary theory proposed by Darwin (1859), selection natural can be defined as the evolutionary mechanism of differential survival and reproduction by which individuals adapt and change over time. Natural selection states that individuals better adapted to their environments will have more chances to survive and reproduce, thereby having more chances to pass their genes to the next generation. Natural selection acts on any heritable phenotypic characteristic, while selective pressure is any environmental factor that influences an individual's survival/reproduction.
Osmosis and diffusion are both examples of passive transport, neither of which requires energy to cross the cell membrane from areas of high concentration to areas of low concentration. Active transport is the process of moving molecules and ions from areas of low concentration to areas of high concentration. Active transport requires energy in the form of ATP.
Answer: The respiratory system works directly with the circulatory system to provide oxygen to the body. Oxygen taken in from the respiratory system moves into blood vessels that then circulate oxygen-rich blood to tissues and cells.
Answer: The correct answer is -
D) in a host, it is capable of reproduction.
Explanation:
Virus can be described as a microscopic, infective, non living agent that typically possesses genetic material (DNA or RNA) that is surrounded by a proteinaceous coat (capsid).
It can not replicate by its own and thus it uses host machinery for replication. In other words, it multiplies within host organism. This is the reason that it can be called as living.
Thus, option D) is the right answer.
