9. Which process usually uses carbon dioxide molecules?
A) cellular respiration
B) asexual reproduction
C) active transport
D) autotrophic nutrition

D) autotrophic nutrition

Explanation: Autotrophic nutrition is a type of nutrition in which a living organism manufacture its own food. For example, plants are autotrophs and they manufacture their own food using chlorophyll present in plant leaves to trap sunlight in the presence of carbon dioxide and water. This process is known as photosynthesis. In photosynthesis, plants use chlorophyll (a green pigment found in the Chloroplast of plant cells) to trap energy from the sun, in the presence of water and carbon dioxide to produce glucose and oxygen. The balanced chemical equation for photosynthesis is 6CO2 + 6H2O + solar energy --> C6H12O6 + 6O2.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation: