in order for cells to carry out the functions needed to sustain life, which of the following must be present in the cell? a cell wall b nucleus c dna and or rna or d flagella which of the following must be present in the cell? a cell wall b nucleus c dna and or rna or d flagella

What is thought to have caused the mass extinction at the end of the cretaceous period?

Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).

What happens when the cell copies its chromosomes