Which statements explain what the fossil record indicates? Check all that apply
A. Earth is 4.5 billion years old
B. Many organisms become extinct
C. Mammals have always existed on earth
D. Mass extinctions have occurred several times on earth
E. The amount of water on earth has decreased over time

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

Which statements best describe monsoons? check all that apply. they force cool, moist air from oceans to rise. they are winds that blow in the opposite direction of a normal wind. they bring rain in the summer and drought in the winter they increase rainfall in south asia, africa, and australia. they influence precipitation as wind moves near a mountain.

Which topic is most likely to be studied by bo which topic is most likely to be studied by botanist? insect metamorphosis, viral infection, plant growth, animal physiology