Answer:
Following are the two types of living things that biologists could study:
1) Animals
2) Plants
Explanation:
As we know plants and animals are the most important organisms. Animals has further categories of living things are on land:
1) Birds
2) Mammals
3) Reptiles
4) Amphibians
Fishes are not included because they are in water but not on land.
 
        
             
        
        
        
Answer:
b) The hydrolysis of ATP helps "pay for the formation of a thioester involving CoA-SH. 
Explanation:
In the citrate cycle, we know that lysis is mediated by the hydrolysis of ATP, which is the fuel of the reaction, so the correct answer is B. The hydrolysis of ATP helps "pay for the formation of a thioester involving CoA-SH. 
 
        
             
        
        
        
Answer:
Yes, the species of a lizard can be identified using dichotomous keys.
Explanation:
A dichotomous key is an identification tool used by the biologists especially taxonomists to identify and classify the organisms.
The dichotomous keys are based on the characteristic feature of an organism for which two which contains two contrasting feature. The dichotomous keys are the most common tools used to classify an organism.
A species of lizard can be identified using these keys by selecting the key characteristic feature  shown by the species which could be quantitative like weight, height or it could be qualitative like colour.  By comparing these characteristics, it becomes easy to identify the species.
 
        
             
        
        
        
Answer: B. It protects the inner organs
Explanation: For example, your ribs protect the lungs, heart, stomach, and more!