If sharks have as skeleton that contains a protein called collagen, then sharks have as skeleton that contains? Answer choices: - elastin - Epidermis - calcium - fur and fat - marrow - strength - all matter - collagen
collagen

If adult sponges produce gametes, then what do adult sponges produce? Answer choices: - cats - lead - gametes - fertile - Energy - food - worms - white
gametes

If when precipitation decreases, so does the food supply, then what decreases when precipitation does? Answer choices: - Pests - Winter - Food - loss - pH - Soda - elms - Sunlight
Food

If many cancers can cause the immune system to not work properly, then what can happen with the immune system when the body has cancer? Answer choices: - a lot of human deaths - It won't work properly - major threat to health - It will work efficiently - hospitalization - It will grow - direct damage to the lungs - It won't do anything
It won't work properly