Which of the following statement is true...

Which of the following statement is true about RBCs in humans?

They do not carry `CO_(2)` at all

They carry about 20-25per cent of `CO_(2)`

They transport 99.5 per cent of `O_(2)`

They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma.

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It contains adenine paired to thymine

One of the bases from DNA is replaced by uracil

It contains the sugar deoxyribose

Its nucleotides contain twice as many phosphate groups as DNA's nucleotides

As guard cells become turgid, the stomata open

There are two guard cells around each stoma

Guard cells take up potassium ions and water enters the guarc cells

Guard cells surrounding stomata lack chloroplasts that other epidermal cells contain