According to the fossil record above, during which era did mammals first appear?

The element nitrogen has the atomic number 7 and an atomic mass of 14. How many neutrons does an atom of nitrogen contain? A. 14 B. 7 C. 0

Why is an ecological pyramid smaller at the top than the bottom

Based on the data in Figure 1, is Mixture C a homogeneous or heterogeneous mixture? Explain your answer

During what type of phase change does a substance release energy

Is there DNA in our food? How do you know?

Which of the following would most likely employ a forester? A. a state governments B. lumber businesses C. national govemments D. all of the above

How do environmental scientists use technology to track polar bears?

A rock formed from liquid magma at temperatures above 1000 degrees Celsius and the. Cooked and hardened what type of rock is it

You sample a population of butterflies and find that 56% are heterozygous at a particular locus. What should be the frequency of the recessive allele in this population? A. 0.07 B. 0.08 C. 0.09 D. 0.70

If there is a mutation in a zygote, where is it likely to be found in the fetus? A: The mutation will show up in any fetal cells formed by mitosis but not in those formed by meiosis.