Which cell structure is referred to as the gatekeeper because it directs substances to move into and out of the cell? a cell wall b nucleus c vacuole d cell membrane?

How are organisms in the domain archaea different from those in the domain eukarya? apex?

What are 2 examples of a gene

What evolutionary development allowed plants to grow tall? see concept 29.3 (page 626) ?

How does ATP differ from ADP?

Erosion occurs when 1. a chemical change happens in rock formation 2. precipitation falls on a rock formation 3. solid particles are deposited elsewhere over time 4. liquid enters the water cycle

Why might it be particularly beneficial for the giant spider crab to be so large?

In which stage of growth do plants rest or grow very little?

Scientists have debated the evolution of three life forms: reptiles, birds and dinosaurs. After many years of reviewing fossil records scientists proposed the evolutionary relationship seen above in the cladogram.

The PNS is divided into several subsystems. What two subsystems form the first major division of the PNS? sensory and motor somatic and autonomic parasympathetic and sympathetic CNS and brain

Consider the model of the food chain. Imagine there is a herbicide poison spill and all the grass is killed. How will this influence the food chain model? A) The grasshoppers will die out. B) All of the consumers will decrease.