The correct answer would be 4 I believe
The area of land<span> that is drained by a particular </span>river<span> and its tributaries is </span>called <span>either a </span>river<span> basin or </span>drainage<span> basin. </span>
Release of a neurotransmitter across the synapse is triggered by the entry of Ca++ into the presynaptic axon. No Ca++ entry means no transmission across the synapse.
Enzymes is a phycical protein folding.
Answer:
Homologous structures provide evidence for common ancestry analogous structures show that similar selective pressures can produce similar adaptations beneficial features Similarities and differences among biological molecules in the DNA sequence of genes can be used to determine species relatedness
