Explanation:
https://docs.microsoft.com/en-us/power-platform/admin/environments-overview

Explanation:
Box 1: No
Box 2: Yes
Power BI Desktop includes a Report view, where you can create any number of report pages with visualizations.
Can you create reports in Power BI service?
In the navigation pane in the Power BI service, you can select the Create button that opens a page where you can select your data source. It's also accessible from the New report button on Home. Currently, we only support creating a report based on an existing dataset, or typing or pasting data directly in a table.
Box 3: No
Can you share Power BI desktop report with others?
Basic Sharing for Dashboards and Reports
You can simply click on the Share button in the dashboard or report, and then share it with other users. By default when you share a Power BI dashboard with this method, then the report and the data set will be shared as well.
Reference:
https://docs.microsoft.com/en-us/power-bi/connect-data/service-get-data
https://docs.microsoft.com/en-us/power-bi/create-reports/desktop-report-view
https://docs.microsoft.com/en-us/power-bi/create-reports/service-quick-create-report
https://radacad.com/power-bi-sharing-methods-comparison-all-in-one-review

Explanation:
Box 1: Yes
You can create a canvas app and then embed that within a model driven app.
Box 2: No
With the capability to build a portal in PowerApps, you can create a website for external and internal users enabling them to interact with data stored in Common Data Service.
Box 3: No
You can use Power BI or use the report feature in Power App without power bi.
Reference:
https://carldesouza.com/how-to-embed-a-canvas-app-in-a-model-driven-app-in-powerapps/
https://docs.microsoft.com/en-us/powerapps/maker/portals/create-portal
https://docs.microsoft.com/en-us/powerapps/maker/common-data-service/data-platform-intro

The Edit/Create screen allows users to add new records or edit existing records in the data source.
The Browse screen displays a list of records in the data source and allows users to filter and sort the records.
The Details screen displays the details of a specific record in the data source.