Although we can't hear them, the ultrasonic pulses are very loud. in order not to be deafened by the sound they emit, bats can temporarily turn off their hearing. muscles in the ear cause the bones in their middle ear to separate slightly, so that they don't transmit vibrations to the inner ear. after an ultrasound pulse ends, a bat can hear an echo from an object a minimum of 1 m away. approximately how much time after a pulse is emitted is the bat ready to hear its echo?

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

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

In 2015, about ten percent of total u. s. energy consumption was from renewable energy sources. renewable energy plays an important role in reducing greenhouse gas emissions. when renewable energy sources are used, the demand for fossil fuels is reduced. sanjay and his family want to cut back on their use of non-renewable resources at home. they are thinking of an alternate way to heat their home without adding more greenhouse gases or pollutants to the environment. which renewable resource would not fit into their plan? a) solar power b) burning wood c) constructing a wind turbine eliminate d) generating hydroelectric power