A parent isotope has a half life of 1 million years. If a rock contained 20 mg of the parent isotope when it formed, how much parent isotope would be left after 2 million years?

How does exercise affect the rate of cellular respiration? CER

Why are nucleic acids not considered a nutrient? (A) Only macromolecules containing nitrogen are considered nutrients. (B) Only macromolecules that produce enzymes are considered nutrients.

An advantage of sexual reproduction over asexual reproduction is that sexual reproduction does what?

In a recessive disorder, a person will only have the disorder if they have one copy of the allele True or False

A patch of weeds growing on soil in early summer may be exhibiting a. interspecific competition b. predation c. mutualism d. parasitism

Fungi fall under the Plantae kingdom. True False

Which of the following is a compound? A) Sn B) Mg C) H D) CO study island

3) Amphibians hatch out of their eggs with: A lungs and develop gills later. B lungs and keep them their whole lives. C gills and develop lungs later. D All of the above.

Who discovered what in photosynthesis?

How does the water cycle play a role in the rock cycle?