PLEASE HELP EMERGENCY PLEASE!! Which organ system is directly harmed by asthma?

Circulatory System

Digestive System

Endocrine System

Integumentary System

Immune System

Muscular System

Nervous System

Urinary System

Reproductive System

Respiratory System

Skeletal System

(This is 7th grade science)

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time