Which of these is required for natural selection to occur?

a. un-equal reproductive success.

b. inheritance.

c. individual variation.

d. all of the answers are correct.

Changing states of water requires energy, where does that energy come from?

A hydrangea plant has blue flowers when grown in acidic soil, but has pink flowers when grown in basic soil. A clone of the pink-flowered plant is grown in acidic soil and produces blue flowers. This change in flower color is most likely due to: A.

A given organism has 46 chromosomes in its karyotype. We can therefore conclude that

Explain blood flow through the heart

Sort the following coleoptiles into the appropriate bins depending on if they will bend to the left, bend to the right, or not bend at all.

After mitosis, how many chromosomes with each daughter cell have

Which organelle stores genetic information? Chloroplast Golgi apparatus Nucleus Ribosome

Jane was involved in an automobile accident in which both her parents were killed. When you ask her about it, she says she has no memory of the accident. What ego defense mechanism is she using?

is a fungal infection in the mouth and throat, producing sore, creamy white, slightly raised curd-like patches on the tongue and other oral mucosal surfaces.

Scientists were able to determine the age of the earth from rock samples that were analyzed. What technique was used to do this