Exercise is a subset of physical fitness.
        
             
        
        
        
All eukaryote cells lack a nucleus
        
             
        
        
        
Plant diversity creates a more nutritionally balanced diet for honey bees, especially in terms of pollen. What other benefit do honey bees gain through this diversity?
Blooms available more for the year
        
             
        
        
        
Answer:
Chromosome number variation: B. Down syndrome
Loss-of-function allele  : D. PKU
Physiological trait
: E. Lactose metabolism
Discovery-based science
: A. Human Genome Project
Genetic cross: C. Model organism
Explanation:
Down syndrome is a condition in which there is an extra copy of the chromosome number 21. Hence, it is a chromosome number variation.
Physiological traits refers to any function of a body. Hence, it matches with lactose metabolism.
Human Genome Project was a project under which the whole genome of the humans were sequenced. Hence, it is a discovery based science.
A genetic cross is made between model organisms to test for the offsprings that would be produced from a cross. Hence, genetic cross and model organism math with each other.