All of the following characteristics are unique to animals EXCEPT

Question

a. cells that have tight junctions, desmosomes, or gap junctions

b. the structural protein collagen.

c. nervous conduction and muscular movement.

d. sexual reproduction.

e. regulatory genes called Hox genes.

Answer 1

d. sexual reproduction.  Plants have been doing it forever.

Answer 2

d. sexual reproduction.  

Plants use sexual reproduction also.  Pollen grains are the male gametes (like sperm), and get delivered to the pistil (the plant female reproductive structure) by pollinators like insects and birds.

Answer 3

well sexual reproduction coz many algae like laminaria,dictyota,sargassum,fucus follow oogamy(union of a small flagellated male gamete(anthrezoid) with a large nonflagellated female gamete (the egg))