How might upward growth of cities be a better choice than outward growth?
a.
upward growth affects less land area than outward growth.
b.
upward growth moderate pollution problems.
c.
upward growth has no limitations.
d.
upward growth has no environmental impact.

Option A, Upward growth affects less land area than outward growth

Explanation:

Upward growth of cities is nothing but the construction of tall building (or vertical development). This causes development of compact cities in which several component of cities are included into a small space due to which land requirement reduces. In other case , cities growing in outward direction (horizontal growth) require large piece of land to accommodate all its components. Thus, upward growth is a better choice as compared to the outward growth in lieu to requirement of lesser land area.

Hence, option A is the correct answer

the answer to your question is b

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation: