Dựa vào nội dung nào chỉ ra được sự khác biệt về sứ mệnh lịch sử giai cấp công nhân so với các giai cấp trước đó

The sun a. will become a red giant within two to three million years b. is in its main sequence, which willlast thousands of years c. is in its main sequence, which will last billions of years. d. will explode as a supernova after its main sequence

Compare and contrast the environmental consequences of reliance on coal with reliance on petroleum.

The approach that contends psychology must study internal mental events in order to fully understand behavior is: