Why are we unable to hear sound in outer space

Climates are classified as tropical, temperate, or arctic based on their?

Sympatric speciation involves reproductive isolation of dispersed populations. is common in plants since many plant species can reproduce by self-fertilization. is often associated with polyploidy in animals.

Which of the followings statements is true? A. Glaciers and ice caps are made of salt water. B. More of Earth's freshwater is found in rivers and lakes. C. The Arctic ice cap floats on top of the Arctic Ocean. D.

Which type of fossil is bone or tooth that have been covered by layers of sediment and preserved into stone. Body Fossil Mold Fossil Resin Fossil Trace Fossil

One of 2 mammals that lay eggs. brown bear echidna ostrich

What should be changed to make the following sentence true? The zygote is a structure connected to the uterus that provides nourishment and oxygen from the mother to the developing embryo via the umbilical cord.

What is the effect of slope on the speed of an object traveling down the slope

According to the calendar, it has been about 14 days since the beginning of the last lunar cycle. Usually, the moon is bright white, but today a dark red moon hangs in the night sky. What are you witnessing? A. a northern light B. a solar eclipse C.

How can you tell if your sanitary landfill is not polluting the environment? A) by smelling it B) by monitoring it C) by observing it D) by reporting it

Humus is made of tiny pieces of weathered parent material. true or false?