Which biological scenario(s) best describes a change in gene expression for a specific trait? (3 points) One identical twin is taller than the other.
One sister has a widow's peak, but her brother does not.
Individuals perform differently on intelligence tests.

I only
II only
II and III only
I and III only

Environmental differences within ecosystems are generally caused by

Which part of the neuron below is indicated by the arrow, and what is its function? hormones send chemical signals throughout the body to regulate other body processes. hormones are chemical signals that are sent throughout the body to regulate other body processes. hormones send electrical signals throughout the body to regulate other body processes. hormones are electrical signals that are sent throughout the body to regulate other body processes.

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).