What happens when you breathe in? (tick all that apply)

• diaphragm relaxes and moves up

• diaphragm contracts and flattens

• increases volume in thorax

• reduces volume in thorax

• pressure in thorax lower than outside

Within the lungs, the exchange of oxygen and carbon dioxide occurs between the ___ and the capillaries. 

• trachea 
• bronchi 
• alveoli
• diaphragm

Which organism is correctly paired with its excretory structure?

• grasshopper - malpighian tubules
• earthworm - nephron
• ameba - skin
• hydra - spiracles

Humans breathe more rapidly during exercise than before it because during exercise the blood contains

• a decreased amount of hemoglobin
• a decreased number of red blood cells
• an increased level of oxygen
• an increased level of carbon dioxide

What type of asexual reproduction is shown?

• binary fission
• sporulation
• vegetative propagation
• regeneration

What do the ovules develop into in a plant?

• the fruit

• the seeds

• a new plant

• the roots system

What do the ovules develop into in a plant?

• the fruit

• the seeds

• a new plant

• the roots system

After fertilization, what does the ovule develop into?

• fruit
• seed
• bud
• flower

The transfer of the pollen grains from the anther to the stigma is called...

• Transpiration
• Pollination
• Fertilization
• Ovulation

Hormone related to the growth of the plant in response to tropisms

• Auxin
• Cytokinins
• Ethene
• Absisic acid