Which best describes the sex chromosomes in humans? a. females have two y chromosomes. b. females have two x chromosomes. c. males have two y chromosomes. d. males have two x chromosomes.

Compare asexual reproduction to sexual reproduction

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

Which chemical reaction shows photosynthesis? a. water + carbon dioxide + sunlight → oxygen + glucose b. carbon + oxygen → carbon dioxide c. hydrogen + oxygen → water d. nitrogen + hydrogen → ammonia