If a radioactive nuclide has a half-life of 1.3 billion years, and it is determined that a rock contains 50% of its original amount of this nuclide, about how old is the rock?

Why are most cells small, and why do they have cell membranes with many convolutions

Which of these has the least impact on the climate of a place? A. altitude of that place B. wind patterns of that place C. topography of that place D. government of that place E. surface of that place

In what way is the sun different from other stars? A. The sun is much closer to Earth than other stars are. B. The sun rotates on its axis, unlike other stars. C. The sun is a huge ball of gas, unlike other stars. D.

A homozygous tall plant is crossed with a heterozygous tall plant (short is the recessive size)

An elements can be determines by looking ay the number of protons

What group includes all animals

What kind of relationship do the mallards have?

A case-control study was performed to determine whether head injury was associated with an increased risk of brain tumors in children.

What biomedical careers start with j

12.01mL + 35.2mL + 6mL=