What is used to model the movement of energy through an ecosystem? Question 12 options:
A food pyramid
A food web
A food chain
all of these

How can you keep track of variables in a science experiment?

Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen