Final answer:
Humans are modifying ecosystems and impacting the food web through various activities such as agriculture, overfishing, and climate change.
Step-by-step explanation:
Humans are actively modifying ecosystems, which has an impact on the food web. The changes in the way food is produced, processed, and distributed on a global scale can have consequences for the balance of the food web. For example, agricultural practices such as clearing forests for farming can disrupt the habitats of certain species and affect their populations. Overfishing can deplete certain fish species, leading to changes in the predator-prey dynamics of the food web.
Additionally, human activities can introduce invasive species into an ecosystem, which can have negative effects on the food web. Invasive species can outcompete native species for resources, disrupt the natural balance, and alter the interactions between organisms in the food web.
Climate change, largely caused by human activities, is also impacting the food web. Rising temperatures and changing weather patterns can affect the distribution and abundance of species, causing shifts in their position in the food web.