It’s above the mesosphere, but below the exosphere. It extends roughly 90 km to 500/1,000 km above. There’s a lot of solar activity that influences temperature there.
Its more logical to say a leaf tissue because of the presence of several tissues inside it which are performing their designated functions.
<h3><u>Explanation:</u></h3>
If we look at the cross section of a leaf, the leaf tissue looks having several tissues. There are vascular bundles in the midrib that are xylem and phloem. Then there are leaf parenchyma which contains the chloroplasts.
They are palisade parenchyma on upper layer and spongy parenchyma. Then there are leaf epidermis on both upper and lower surfaces of leaf. So because of the presence of different tissues, they are collectively called as leaf tissue.
C) DNA is made of 4 types of nucleotides
Not all organisms have 46 chromosomes (23 homologous pairs). Not all organisms have nuclei (e.g. bacteria do not have nucleus)
Its ability to form endospores in harsh conditions
