Answer:
c. a natural disaster
Explanation:
A limiting factor in an ecosystem can either be density dependent or density independent. A density independent limiting factor is that which does not rely on the density of a population to affect it's size.
A density independent factor affects the population size irrespective of how densely populated the population is. Examples of density independent limiting factors that can affect a population are natural disasters like fire outbreak, hurricane, earthquake etc.
Answer:
It processes the environment and sends out signals.
Explanation:
Sense receptors can sense any changes in internal or external conditions which disturb the homeostasis. The sensory information is sent to the central nervous system which in turn process the information and commands the respective body parts to perform actions to restore the homeostasis.
Example: The information about increased demand of oxygen during exercise is sent to the brain which in turn commands parts of breathing system and cardiovascular system to increase the breathing rate and heartbeat rate respectively to compensate for increased oxygen supply.
Answer:
Genetic variations that alter gene activity or protein function can introduce different traits in an organism. If a trait is advantageous and helps the individual survive and reproduce, the genetic variation is more likely to be passed to the next generation (a process known as natural selection)
Answer:
A hydrogen bond is a type of attractive (dipole-dipole) interaction between an electronegative atom and a hydrogen atom bonded to another electronegative atom. This bond always involves a hydrogen atom. Hydrogen bonds can occur between molecules or within parts of a single molecule.
4, Radiated heat from the Sun being absorbed by the ground.
