If old mountains are worn down over the course of millions of years, what is one of the primary reasons that mountains still exist?

a.

new mountains are created through tectonic and volcanic activity.

b.

new mountains are created from decomposition of plants and animals.

c.

new mountains are created from leaf litter.

d.

new mountains are created through city development.

What is mitosis and how does it affect change

Which of these is a major trend in land plant evolution? a) the trend toward smaller size b) the trend toward a gametophyte-dominated life cycle c) the trend toward a sporophyte-dominated life cycle d) the trend toward larger gametophytes

Ry was studying two populations of the same species of lizards. one population lived on an island and the other lived on the mainland. both populations were affected by a hurricane that hit the island and the mainland with equal force. a year later, henry was testing the gene frequency and saw a decrease in genetic variation in the island species, but not in the mainland species. which best describes a conclusion he might have reached? gene flow greatly affects small populations, but large populations can recover. genetic drift greatly affects small populations, but large populations can recover. gene flow greatly affects large populations, but small populations can recover. genetic drift greatly affects large populations, but small populations can recover.