Hormonal Systems of Invertebrates

Multiple Choice

Hormonal systems of invertebrates

A) are solely neurosecretory systems in which neurosecretory cells may be aggregated into neurohaemal organs.
B) are generally not well known, although an extensive literature exists for the molluscs.
C) can include separate endocrine organs as well as neurosecretory systems in higher invertebrates.
D) operate on the basis of peptide hormones only.
E) only control growth and development.