Which of the following is a major concern regarding the release of genetically modified organisms into the environment?

• A. They are more expensive to cultivate
• B. They can crossbreed with native species affecting biodiversity
• C. They do not grow as efficiently as natural species
• D. They lead to increased soil erosion

Answer: (B)

The concern regarding the release of genetically modified organisms (GMOs) into the environment primarily revolves around their potential to crossbreed with native species. This genetic exchange can lead to hybridization, where the characteristics of the GMOs may be introduced into wild populations. Such hybrids may possess traits that allow them to outcompete native species for resources, disrupt existing ecosystems, and ultimately affect biodiversity. This is particularly worrisome because it can lead to the displacement or extinction of native species, reducing genetic diversity and altering the dynamics of the ecosystems in which these organisms reside.

The other options do not reflect the primary ecological concerns related to GMOs. For instance, the economic aspect of cultivation costs is not a direct environmental issue, and the efficiency of growth of GMOs compared to natural species does not inherently threaten ecosystems. Additionally, while soil erosion is a relevant topic in agricultural practices, it is not a specific outcome directly tied to the release of GMOs into the environment.