Answer:
The growth of forests.
Explanation:
The Carboniferous Period occurred around 300 million years ago
It is named because many coal beds were formed during this era.
During, the Carboniferous period the first extensive forests appeared on Earth. The expansive growth of these forests removed huge amounts of carbon dioxide from the atmosphere.
Answer:
7.4 Ω
Explanation:
Let,
R1 = 5 Ω
R2 = 4 Ω
R3 = 6 Ω
R1 is connected series.
R2 and R3 are connected in parallel.
1 / Rp = 1 / R2 + 1 / R3
= 1 / 4 + 1 / 6
= 3 / 12 + 2 / 12
1 / Rp = 5 / 12
Rp = 12 / 5 = 2.4 Ω
Effective resistance
= R1 + Rp
= 5 + 2.4
= 7.4 Ω
Therefore, the combined resistance of 5 ohms wire arranged in series with a parallel arrangement of 4 ohms and 6 ohms wires is
7.4 Ω.