A large flock of endemic birds is discovered on a remote island. There appears to be two similar but different kinds of birds within the flock. Which of the following information is most important in deciding whether the two kinds of birds belong to a single species?a.) whether both kinds of males sing similar songs
b.) whether both kinds of birds eat the same range of food
c.) whether the matings between kinds produce viable offspring
d.) whether both kinds mate with one another
e.) whether both kinds share many physical characteristics

Which of these statements are true about scientific theories and hypothesis

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

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