Jim was observing a frog embryo in which the brain and spinal cord were formed. In what stage is the embryo?

A. neurula stage

B. blastula stage

C. gastrula stage

Why doesn't the united states use 100 renewable energy There are not enough sources of renewable energy Renewable energy producers don't qualify for tax incentives Fossil fuels are still relatively inexpensive compared to renewable energy

Which of the following statements about the tundra is true? a. The tundra has a dense covering of trees. b. There are two main categories of the tundra biome. c. Temperatures in the tundra range from extreme highs to extreme lows. d.

Do electrons from all shells participate in atomic bonds?

Which of the following is the most cost effective source of energy?

Compare and contrast the way that fungi degrade lignin with the way that they digest cellulose. what do they have in common?

Make a concept map/organizer to relate the actions of the nervous, skeletal, and muscular systems to a stimulus.

If the temperature increases and the barometric pressure falls, then what is likely occurring? A. Cold, moist air mass is approaching as a cold front. B. Warm, moist air mass is approaching as a warm front. C.

What is 23x9 (54-9) x-273≈9273√³

What are three heat sources for metamorphism?

About 10% of women experience severe pain at the entrance of the vagina. this is known as