30. The sweeper tentacles of corals contain: a. Zooxanthellae
b. Stinging cells called nematocysts
c. Specialized spicules
d. Bad-tasting chemicals

d. in sexual reproduction, offspring have more chromosomes than

either parent.

asexual reproduction results in offspring which are genetically the same as the parent organism (not counting a rare mutation). sexual reproduction produces a random mixture of the genetics derived from both parents

explanation:

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

it's c. (to reduce the greenhouse effect/carbon gasses)