Answer: 3
Explanation:
 The black widow, the hobo spider, and the brown recluse spider are all poisonous. They all have lethal venom.
 
        
             
        
        
        
Answer:
notochord, a dorsal hollow nerve cord and pharyngeal slits. 
 
        
             
        
        
        
Human activites  have greatly increased carbon dioxide levels in the atmosphere and nitrogen levels in the biosphere. Altered Altered biogeochemical cycle combined with climate change increase the vulnerability of biodiversity, food security, human health, and water quality to a changing climate.
        
             
        
        
        
Explanation:
A university is building a new student center that is one third the distance from the arts center to the Academic.
 
        
             
        
        
        
Answer:
The correct answer will be option- B.
Explanation:
Synovial fluid is a clear slippery fluid which is present in the synovial cavity.
The synovial fluid helps the nourishment as it provides nutrients to the and oxygen to the hyaline cartilage of the bones as well as the lubrication of the cartilage surfaces due to the viscous nature like oil which lubricates the piston.
This smooth surface facilitates the smooth and painless movements between the bones, therefore, the Option-B is the correct answer.