Choose the correct arrangement of the sentences to make a meaningful paragraph/letter

a. In addition to providing food for themselves, plants are a fundamental source of nutrition for herbivores, which form the second trophic level in the ecosystem.
b. In conclusion, the multifaceted contributions of plants highlight their crucial role in maintaining the balance and sustainability of the ecosystem.
c. Furthermore, plants contribute to the water cycle by absorbing water from the soil and releasing it into the atmosphere through a process called transpiration.
d. Plants play a vital role in the ecosystem by serving as the primary producers in the food chain.
e. Secondly, the oxygen released during photosynthesis is essential for the survival of many organisms, including animals and humans.
f. Firstly, they capture sunlight through photosynthesis, converting it into energy for their growth and development.