You are presented with the question "What can low iron cause?" and the following answer choices: - contamination - Pollution - decrease stamina - harmful substances - immunodeficiency - the ground shaking - cloudy and rainy weather - Temperature changing Now knowing that immunodeficiency occurs when the immune system is not working properly and iron deficiency causes anemia and it weakens the immune system, choose the best answer.
immunodeficiency

You are presented with the question "what are used to reproduce?" and the following answer choices: - flagella - nectar - ocean - bacteria - sound - eggs - ferns - bulbs Now knowing that roundworms reproduce sexually and roundworm eggs are comparatively large, choose the best answer.
eggs

You are presented with the question "Some strange life forms have an envelope of what?" and the following answer choices: - Chemical energy - biological diversity - Something coming from a gland - layers of fat - characteristics - phospholipids and proteins - Positive charges - visible energy Now knowing that some viruses have an envelope of phospholipids and proteins and viruses are strange life forms, choose the best answer.
phospholipids and proteins