Which of the following is true about pollen grains?
a. pollen grains are poisonous. you should not smell flowers.
b. a pollen grain is an egg cell that is fertilized by male egg cells.
c. pollen grains are used to make honey for bees.
d. a pollen grain will divide to form sperm to be used for reproduction.

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food