In a food chain, the trophic level with the greatest amount of energy is: MCQ with Answer and Explanation

Explanation:
Alveoli are tiny, thin-walled air sacs surrounded by pulmonary capillaries. Oxygen diffuses across the alveolar and capillary walls into the blood, while CO₂ diffuses out. The trachea, bronchi, and nasal cavity are air passages that do not participate directly in gas exchange.

Explanation:
Pollination is the transfer of pollen from the anther to the stigma of a flower, a prerequisite for fertilization. Fertilization is the fusion of male and female gametes. Germination is seed growth, dispersal is seed spreading.

Explanation:
Molecular cloning involves inserting a DNA fragment into a vector (e.g., plasmid), which is then taken up by host cells (e.g., E. coli). As the bacteria replicate, they produce many copies of the inserted DNA, creating a gene library. PCR amplifies without vectors, sequencing reads bases, microarrays analyze expression.