Help please due at midnight XD

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed

In an effort to japan recover from the devastating effects of the 1929 depression, japanese military leaders in the 1930s formed an alliance with nazi germany negotiated more trade treaties with the soviet union closed its doors to western trade adopted a policy of imperialist expansion

Which of the following is an environmental cost of agriculture? a. agronomyb. cash cropsc. pollutiond. crop rotation