Why is heartwood darker in color than sapwood?
a.
heartwood is closer to the center of the stem; sapwood is away from the center of the stem.
b.
heartwood does not conduct water; sapwood is active in fluid transport.
c.
heartwood contains xylem tissue; sapwood contains phloem tissue.

Did you know that a single bee would have to go to over 2 million flowers to make a single pound of honey?

Choose the correct words to complete the sentences related to genetic screening. is a procedure that is used during pregnancy to detect genetic defects. is extracted from the uterus and used to identify genetic disorders?

Which of the following is a good definition for the word adaptation? question 1 options: a trait that an organism survive and reproduce in its environment. a change in an organism's environment. the way in which animals obtain food. a temperature change that can cause the extinction of plants and animals.