Hi there!
The answer is 4) determining the true age of rock layers.
Relative dating is only used to determine the rocks in sequential order from oldest to newest, absolute dating can give an estimated time to the age of the rock.
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Answer:
Apart from AB-type, other genotypes that would be formed will be A- blood type, B- blood type and O-blood type (the probability for each genotype is one-quarter )
Explanation:
As the parents are heterozygous in blood type, the gametes formed will be of IA, IB and i types, and thus the formed genotypes A- blood type, B- blood type and O-blood type will have same probability as that of AB-type.
 
        
             
        
        
        
Al's cat is displaying territoriality by marking his territory by marking territory with urine and scratches. 
Territoriality
Territoriality is the defense of the area where an organism lives. The marked area is often regarded as the territory of the animal living there. Al's cat is marking its territory by urinating on the plants and scratching them. Other animals that enter the territory of the cat will be able to know that the territory is not theirs and keep themselves away from the same. If an animal invades the territory of another animal it might get attacked by the animal whose territory it just invaded.
Marking the territory often comes with many perks as the animal is able to lay claim to the food, nest locations, shelter, interactions with mates, etc. The animal is able to monopolize the space in which they live. 
Learn more about territoriality here:
brainly.com/question/806271
#SPJ4
 
        
             
        
        
        
False, an environment containing no calcium is not the best for Brian shrimp egg hatching. The following evidence statements can be used to support our answer.
- Control shows 9 hatchlings after 72 hours whereas the treatment of 10mg/100ml concentration of calcium shows 17 hatchlings.
- Control shows 9 hatchlings after 72 hours whereas the treatment of 20mg/100ml concentration of calcium shows 28 hatchlings.
- Control shows 9 hatchlings after 72 hours whereas the treatment of 10mg/100ml concentration of calcium shows 39 hatchlings.
 
        
             
        
        
        
Answer:
it can get caught in equipment, catch fire or fall into chemicals
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