the net movement of carbon dioxide down the carbon dioxide concentration gradient

the net movement of carbon dioxide up the sugar concentration gradient

the net movement of oxygen down the carbon dioxide concentration gradient

the net movement of sugar moving up the sugar concentration gradient

It decreases enzyme activity.

It denatures enzymes.

It increases enzyme production.

It kills cells.

amino acids- $\sqrt{ }$  , energy- $\sqrt{ }$  , glycerol- $X$  

amino acids- $\sqrt{ }$  , energy- $X$  , glycerol- $\sqrt{ }$  

amino acids- $X$  , energy- $\sqrt{ }$  , glycerol- $X$  

amino acids- $X$  , energy- $X$  , glycerol- $\sqrt{ }$  

crown and root

dentine and enamel

enamel and gum

enamel and pulp

1-artery, 2-capillary, 3-vein

1-artery, 2-vein, 3-capillary

1-capillary, 2-artery, 3-vein

1-capillary, 2-vein, 3-artery

temperature-high, humidity-high

temperature-high, humidity-low

temperature-low, humidity-high

temperature-low, humidity-low

Y-photosynthesis, Z-growth

Y-photosynthesis, Z-respiration

Y-respiration, Z-growth

Y-respiration, Z-photosynthesis

so that food can be pushed through the holes

so that the pet can see out

so that urine can drain out

to allow the exchange of oxygen and carbon dioxide with the outside

adding acid to food in the stomach

breathing out water vapour from the lungs

keeping the body temperature constant

producing adrenaline in the adrenal glands

temperature and water only

temperature only

temperature, water and oxygen

water and oxygen only

A woman’s menstrual cycle controls when she can become pregnant.

Both parents are often involved in bringing up the baby.

Human babies can be fed entirely on breastmilk.

Joining of nuclei from sperm and egg must take place.

A

B

C

D