What determines how radioactive an atom is

Tina and Jill have two balls, ball A and ball B. Ball A is twice as heavy as ball B. Tina and Jill push the balls with the same strength across the same flat surface. What will happen to the balls? A. Neither ball will roll at all B.

How can fossils be used to show the evolution of modern species?

Two pink-flowering plants are crossed. The offspring percentages are 25% red, 25% white and 50% pink. What would the parent's genotypes be? A. both homozygous dominant B. both homozygous recessive C. both heterozygous D.

Which statement best describes how modern taxonomists classify and organism? A) They examine the vestigial structures of the organism. B) They use DNA sequences to determine if the organisms makes proteins.

The pulsatile nature of blood pressure is greatest in which blood vessels?

While on an archaeology expedition, you unearth a skeleton with the following characteristics: four long, slender finger bones and a smaller opposable thumb bone, long arm bones, fingernails, and eye sockets close together on a skull.

Describe respiration

Which of the following is a property of minerals? a. Age b. Odor c. Hardness d. Size

What created the abundant agriculture in the Napa Valley of California? A:oceanic-continental convergence B: an earthquake C: a tsunami D:continental-continental convergence

Why is it difficult for most chemical reaction in living things to occur without enzyme?