Identify each of the cell structures indicated in figure 7-7 and explain its role in the cell. be sure to indicate the letter that corresponds with each structure

A. Nucleus envelope.

Used in regulation of macromolecules  like proteins and mRNA but permits water, ions and ATP into the nucleus.

B. Cytoplasm

This is an environment for other organelles and is location for many metabolic processes.

C. Endoplasmic reticulum

Used for transport of materials , proteins  and lipid synthesis.

D. Nucleus

Acts as repository for genetic information, control center of the cell. 

E. Nucleoplasm

provides environment for nucleotides, enzymes and chromosomes.

F. Mitochondrion

For energy production through use of tricarboxylic acid cycle and electron transport chain among others. 

G. Golgi apparatus

Packaging and secretion of materials for various purposes.

H. Secretory vesicles

Transport of materials, enzyme storage and also involved in metabolism.

d. changes in climate and historical records

hope this