Joanna makes a model of an ecosystem in a terrarium. Her terrarium has water, soil, a heat lamp, plants, rocks, frogs, and an overhead lamp. Which parts of the ecosystem represent the sun?

D Heat lamp and overhead light.

Explanation:

  I took the quiz and got a hundred its the right answer.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.