powdery mildew diseases infects many plant species. it common on roses, lilacs, english oak, sycamore, some deciduous azaleas and zinnias. usually when powdery mildew infects one type of plant, it does not infect any other type. each plant type is unique in that the powdery mildew that infects it will not infect any other.

powdery mildew is caused by
a) a virus.
b) a fungus.
c) genetics.
d) a bacteria.

the answer for apex is "1 and 6"

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation:

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.