angularjs dropdown

1 <select ng-options="v.name for v in variants | filter:{type:2}" ng-change="calculateServicesSubTotal(item)"
2ng-model="item.selectedVariant" ng-show="item.id==8" name="posterVariants"
3ng-required="item.id==8 && item.quantity > 0" class="ng-pristine ng-valid ng-valid-required">
4    <option value="?" selected="selected"></option>
5    <option value="0">set of 6 traits</option>
6    <option value="1">5 complete sets</option>
7</select>

1<mat-menu #animals="matMenu">
2  <button mat-menu-item [matMenuTriggerFor]="vertebrates">Vertebrates</button>
3  <button mat-menu-item [matMenuTriggerFor]="invertebrates">Invertebrates</button>
4</mat-menu>
5
6<mat-menu #vertebrates="matMenu">
7  <button mat-menu-item [matMenuTriggerFor]="fish">Fishes</button>
8  <button mat-menu-item [matMenuTriggerFor]="amphibians">Amphibians</button>
9  <button mat-menu-item [matMenuTriggerFor]="reptiles">Reptiles</button>
10  <button mat-menu-item>Birds</button>
11  <button mat-menu-item>Mammals</button>
12</mat-menu>

1    <select name="singleSelect" ng-model="data.singleSelect">
2      <option value="option-1">Option 1</option>
3      <option value="option-2">Option 2</option>
4    </select><br>