Answer:
D. By adding the vectors

Explanation:
Given
Represent the velocity of the river current as VR

Represent the velocity of the boat as VB

Required
How to calculate the velocity of boat relative to river current
From the question, we understand that both move in the same direction.
So, the relative velocity V is calculated as:



Notice that the both velocities are added together to get the relative velocities.
This is so because they both move in the same direction
<em>From the list of given options, only option D is correct.</em>
<span>Natural selection affects predator-prey relationships in ecosystems in ways such as: A and B</span>
Explanation:
the bill of rights is 10 amendments
The answer to your question is: True. The ancient egyptiants participated in sports such as wrestling, long jump, swimming, rowing, etc
The Andes have had all of the given effects on the people except some native Indians have developed unusual physical characteristics that make it easier for them to live at high altitudes.
Option: D
Explanation:
Andes mountain a renowned fold mountain of South American continent. It is characterized by higher elevation and various relief features. Agriculture, mining both is prevalent in the surroundings of Andes mountain. Due to higher elevation terrace farming is followed. It is also rich source of minerals. The people who live there have adopted some physical features to sustain their lives over there. Andes is well connected with other neighboring states and urban area. Main indigenous people who live there are Inuits, Yupik and Aleuts.