Describe the defense mechanisms evolved by plants to reduce predation by herbivores.

There are two types of defense mechanism of plants against herbivorous

1-Mechanical defense

2-Chemical defense  

Explanation:

Mechanical defense is a first line defense in which plant makes barriers which is made up of wax cutical and bark and they form spines on leaves, thorns on branches which can helps in resistance and physical damage to animals.

Chemical Defense is a type in which plant produces some metabolites, toxins and chemicals which is very toxic to animals and helps in defense example alkaloids.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

explanation:

idk