Answer:
C. The concentrations of products and reactants are equal.
Explanation:
A reaction has reached equilibrium when the concentrations of products and reactants are equal.
Regulation of gene expression using siRNAs is found in eukaryotes only.
Chlorophyll, Chloroplast and heoglobin <span />
Animals with chitinous exoskeletons and jointed appendages are classified as Arthropods.
<span>
Arthropods are invertebrates which have an exoskeleton (external skeleton) enveloped with cuticle of chitin, a segmented body, and paired jointed appendages (each segment contains a pair of appendages). The cuticle is a rigid structure (usually mineralised with calcium carbonate), so those animals must replace it periodically by moulting. Arthropods include insects, arachnids, myriapods, and crustaceans.</span>
