Which of the following statements about the nucleus is true? a. the nucleus usually contains a nucleolus region which is where mitochondria assembly begins. b. the nucleus is surrounded by cell membrane that lets materials in and out. c. the nucleus is the site of protein assembly. d. the nucleus stores the coded instructions for making the cell’s proteins.

Contrast how pollination is different among gymnosperms and angiosperms.

Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla

When you run, you begin to breathe heavier and faster. your heart beats more quickly, bringing more oxygen to your cells. which organ systems are working together here?