You are presented with the question "What does fire require to get started?" and the following answer choices: - an engine - activation energy - water - energy usage - direct energy - dogs - activated almonds - adding heat Now knowing that all chemical reactions require activation energy to get started and fire is a chemical reaction, choose the best answer.
activation energy

You are presented with the question "What gland helps regulate the metabolic rate in the body?" and the following answer choices: - dehydration - Veins and arteries. - Prostate glands - H2O glands - Pituitary gland - pancreas - sweating - Anal scent glands Now knowing that tRH stimulates the pituitary gland to produce thyroid-stimulating hormone, or TSH and thyroid hormones regulate the metabolic rate in the body, choose the best answer.
Pituitary gland

You are presented with the question "what has permeable skin that easily absorbs substances from the environment?" and the following answer choices: - ferns - a fish - humans - animals - scales - bats - skin cells - frogs Now knowing that amphibians have permeable skin that easily absorbs substances from the environment and all frogs are amphibians, choose the best answer.
frogs

You are presented with the question "Immunodeficiency occurs when the immune system is what?" and the following answer choices: - dangerous - homogenous - healthy - broken down - reduce - perfect - It decreases - functioning Now knowing that immunodeficiency occurs when the immune system is not working properly and work items are broken down by year of effort, choose the best answer.
broken down