It’s a marine/ sea sponge it is a underwater invertebrate. It is classified as animal . Also Sea sponges do not have cell walls or chloroplast typical of plants, but contain animal cells.
        
             
        
        
        
Answer:
Chromatid
Explanation:
A chromatid is one of two identical halves of a replicated chromosome. ... Following DNA replication, the chromosome consists of two identical structures called sister chromatids, which are joined at the centromere
 
        
             
        
        
        
It was not until the year of 1952!
        
             
        
        
        
I believe it’s d your welcome I hope this helped I’ve answered this question