Let's analyze each option to determine which statements are correct regarding natural complexes:
"Природные комплексы изменяются в масштабах геологического времени." This statement is correct. Natural complexes are dynamic and evolve over vast geological timescales due to processes like plate tectonics, climate change, and evolution.
"Воздействие человека на один из компонентов природного комплекса обязательно сказывается на состоянии других, а также и всего природного комплекса." This statement is also correct. Natural complexes are interconnected systems. A change in one component (e.g., deforestation) can have cascading effects on water cycles, soil erosion, biodiversity, and the overall stability of the complex.
"Человеческая деятельность не может глобально изменить природные комплексы Земли." This statement is incorrect. Human activities, such as industrial pollution, urbanization, and climate change, have profound global impacts on natural complexes, altering ecosystems on a planetary scale.
"Воздействие человека на один из компонентов природного..." This statement is incomplete and therefore cannot be evaluated as a standalone correct statement.
Based on the analysis, the first two statements are accurate descriptions of natural complexes and human impact on them.