In his theory of evolution, Charles Darwin was not able to explain (1.) competition
(2.)overproduction
(3.) reproduction
(4.) variation

4 Charles Darwin was not able to explain the variation

1 digestive system

2 stomach

3 bladder

4 carbon deoxide

5 tiger

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.