Hummingbirds can flap their wings as fast as 80 times in one second! In order to produce enough energy to maintain this rate, muscle cells in hummingbird wings must contain: Large amounts of mitochondria
Large amounts of proteins
Large amounts of enzyme
Large amounts of CO2

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.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.

burning fossil fouls really decrease the carbon in the atmosphere so b