Question

the international astronomical union determined that pluto did not meet the criteria needed to be considered a planet. pluto was downgraded to the status of a dwarf planet in 2006. which sentence effectively combines the two sentences above using a subordinating conjunction? select the two correct answers. (1 point) after the international astronomical union determined that pluto did not meet the criteria needed to be considered a planet, pluto was downgraded to the status of a dwarf planet in 2006. the international astronomical union determined that pluto did not meet the criteria needed to be considered a planet, and pluto was downgraded to the status of a dwarf planet in 2006. although the international astronomical union determined that pluto did not meet the criteria needed to be considered a planet, pluto was downgraded to the status of a dwarf planet in 2006. the international astronomical union determined that pluto did not meet the criteria needed to be considered a planet, so pluto was downgraded to the status of a dwarf planet in 2006.

Explanation:

1. Analyze the first option: "After" is a subordinating conjunction. The sentence shows the sequence: first the IAU's determination, then Pluto's downgrading. This is correct.
2. Analyze the second option: "and" is a coordinating conjunction, not subordinating. So this is incorrect.
3. Analyze the third option: "Although" is a subordinating conjunction, but the logic here is flawed (the downgrading is a result of not meeting criteria, not a contrast). So this is incorrect.
4. Analyze the fourth option: "so" can act as a subordinating conjunction (or a coordinating one in some cases, but here it shows the cause - effect: because the IAU determined Pluto didn't meet criteria, Pluto was downgraded). This is correct.

Answer:

A. After the International Astronomical Union determined that Pluto did not meet the criteria needed to be considered a planet, Pluto was downgraded to the status of a dwarf planet in 2006.
D. The International Astronomical Union determined that Pluto did not meet the criteria needed to be considered a planet, so Pluto was downgraded to the status of a dwarf planet in 2006.