Historically, african elephants have had large ivory tusks. for many years, poachers (illegal hunters) have been killing elephants that have large tusks so they could sell the ivory, which is valuable. now many african elephants have small tusks or do not develop tusks at all. which of the following is true?

the trait of tusk size in elephants has changed over time.

poaching has had no effect on the size of elephant tusks.

elephants without tusks are more likely to be hunted than elephants with large tusks.

elephants without tusks cannot reproduce.

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