Answer: The correct answer for the fill in the blank is A) Circulatory, immune.
Circulatory system also called cardiovascular system is a vast network of organs and vessels that allow the circulation of blood so as to transport nutrients, oxygen, other gases, and hormones to different parts of the body.
Blood contains different cells like white blood cells, red blood cells, platelets.
White blood cells ( also called leukocytes) work closely with immune system. They provide defense against pathogen ( disease causing organisms) through various ways ( like ingesting foreign material, producing antibodies to clear the antigens). By doing so, they protect us from infection and disease.
Explanation:
it ensures the entire research methodologies are scientific and valid
The correct answer would be the Sun or sunlight
People would have made it easier to destroy the world by releasing pollutants which can destroy the ozone layer and cause global warming. <span>The sudden increase in temperature would cause an imbalance in the ecosystem. In effect, this would cause declined population of animals and a disturbance of plant growth. People would also have an increasing problem in lung related diseases.</span>
Answer:
photosynthesis
Explanation:
Photosynthesis is the process by which organisms that contain the pigment chlorophyll convert light energy into chemical energy which can be stored in the molecular bonds of organic molecules (e.g., sugars). Photosynthesis powers almost all trophic chains and food webs on the Earth.
