Which of the following is not a way that humus affects the properties of soil?

a. humus expands with increased moisture levels
b. humus increases the movement of water and air in soil.
c. humus decreases the porosity of soil
d. humus acts as a basis for soil life

Which statements describe resources? one of the factors people use when deciding where they will live is the availability of resources. renewable resources have little value for people. resources are unevenly distributed throughout the world. energy is the world resource which has the highest use. the use of nonrenewable resources has decreased in recent history. the use of resources is evenly distributed throughout the world. the world's oil supply will last for the next forty years if its use continues as expected.

How do the sperm cells get from the stigma to the ovules?

Some substances but not other can cross the (blank) membrane of a cell