How many types of organisms are there on Earth?

tens

thousands

millions

hundreds

A pair of non-radioactive, homologous chromosomes replicates once in the presence of radioactive DNA precursors. Assuming that new DNA will incorporate these precursors, which parts of the chromosomes will now contain radioactive atoms?

Why are some volcanoes explosive while others are not?

List the four questions asked to determine if a substance is a mineral

there are approximately 200different type of cells in the human body. all cells are dependent on other cells to perform body function

Is the hair superior to the brain?

In both bergmann's and allen's rules, surface area plays a major role in how heat is conserved or dissipated. what happens in animals with greater surface area?

The nucleus and other organelles of a neuron are primarily housed in which part of the cell? axon dendrite glial cell cell body none of the choices is correct.

Which structure carries a mature egg from ovary to uterus?

What happens when something goes wrong with the genetic material and how can this defect be detected?

Fill in the blank. competition drives natural selection, as individual members of a species compete with each other for limited natural resources, 2.