Which of the following ideas is supported by darwin's observations of local variation among tortoises in the galapagos islands?
a: artificial selection
b: adaption
c: acquired characteristics
d: tendency towards perfection

When analyzing tree rings, what do scientists assume a thin ring indicates?

Nerve cells are specialized to respond to stimulitrue or false?

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