The sum of ages of two brothers is 22 years six years ago the product of their ages was 21 years. find the age of the brother

What is the relationship between a genome, chromosomes, and genes?

Water loss from the ___ of a plant creates a pull on water within the ___, causing water to be drawn upward in the plant. cuticle, phloem leaves, xylem leaves, phloem bark, parenchyma

When two pure breeding parents are crossed describe how the dominant trait would be identified?

Ancestors of the koala lived on the ground, but modern koalas live in trees and eat eucalyptus leaves, which are poisonous to most other animals. The difference between the ancestor and modern koala was caused by ... A.

The denaturation of proteins in a cell would have a profound effect on which of the following cellular activities? Choose all that apply.

When energy from the sun hits the air above land, the air warms and rises. Along a coastline, cooler air above the ocean flows toward the land to replace this rising air. Which of the following best describes these processes. F.

Consider a population of bacteria that came from a single ancestor. because bacteria reproduce asexually, there should be no variation in this population, but that violates the first postulate of natural selection.

Through what process do cells become specialized so they can perform specific functions within organisms?

How does a gradient of a river affect its flow

What is the main function of cuticle in plants? 1. It prevents water loss. 2. It absorbs sunlight. 3. It protects the plant from predators.