Answer:Based on the search results, here's what we know: Trees: - Total species of trees: Scientists estimate there are approximately 73,300 tree species in the world, with over 9,000 yet to be discovered. - Total items of trees: A recent study published in Nature journal estimates there are over 3 trillion trees in the world. This number represents individual trees, not species. Plants: - Total species of plants: The number of plant species is estimated to be between 270,000 and 400,000. [6][8]- Total items of plants: It's impossible to count the exact number of individual plants in the world, but it's estimated that there are approximately 320,000 plant species worldwide. Important Notes: - The number of tree species and individual trees is still being researched and refined.- The total number of plant species is a broad estimate, as many species are yet to be discovered.- These numbers highlight the immense diversity of plant life on Earth and the importance of conservation efforts.