Although they are extinct, these were the first seed plants.

ferns

seed ferns

angiosperms

conifers

Our what is complex but is based on units that are simple

What is taxonomy? A. The science of classification B. A subgroup of organisms C. An organism's evolutionary history D. The classification of plants based on their medicinal uses

As a fertilized egg divides the cells differentiate because they A. Contain a lipid bilayer B. Have specific genes activated C. Metabolize sugars rapidly D. Can clump together

How can meiosis used explain how a fatal disease can persist in a family?

When the organism expresses a set of genes, the result is the characteristics of that organism. these characteristics are called its?

Dna stands for what in biology

Coal is used to produce energy. The harmful gases produced by coal are cleaned up by a method which needs a large amount of limestone. Predict and explain the long term effect on the environment of obtaining and using limestone.

True or false two genes may not segregate independently if they are on the same chromosmoe

Blood pressure rises and falls in a pattern corresponding to the phases of the

Immune system cells enter a resting phase after undergoing mitosis. when activated-for example, by an infection-they can reenter the sequence of events in the cell cycle that leads to cell division.