Are there choices ???/ or are we supposed to infer ???????????
Answer:
Nucleus, chromosome, gene
Explanation:
The nucleus is the part of the cell where chromosomes are found. A human cell has 42 chromosomes. The chromosome have genes on them (made up of DNA strands – the strands are made of nucleotides). A gene is a sequence of nucleotides of the DNA that code for a functional protein.
The food chain describes who eats whom in the wild.
B. Transport oxygen through the blood.