What causes a branch in a cladogram?
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a. an ancestral trait
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b. a birth or death
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c. a trait passed along
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d. a new trait

The correct option is D. A new trait

Explanation:

A cladogram can be described as a diagram which depicts the evolutionary similarities and differences among different species.

Whenever a new trait is seen in an organism, a branch is made in the cladogram to depict that change from others. The organisms that are similar or share evolutionary history are termed as clades. Branches in between them depict the changes in these similar clades.

ocean expansion, global warming is melting icebergs and causing water levels to rise.

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!