A rigid cell wall is found in plants so they can hold themselves up.
Answer:
4. wedge and lever
Explanation:
Simple machines are mechanical devices which make our work easier. Examples are : lever, wedge, wheel and axel, pulley, screw and an incline plane.
A stapler is a made up of a level which is the handle part and a wedge which are the staples.
A pulley is a simple machine that has one or more wheels connected with a rope in a loop to make lifting of loads easier because it changes the direction of force applied/pull thus multiplying the force applied. <em>A stapler does not have the wheel and the rope thus answer choice 1 and 2 are incorrect.</em>
A screw is a simple machine that applies torque on a shaft to produce a large axial force on the load. It utilizes the conversion of rotational motion to a linear motion and a torque to a linear force. <em>A stapler mechanism does not involve rotational motion or rotational force, hence answer option 3 is incorrect.</em>
Humans produce few offspring throughout multiple reproductive episodes.
Explanation:
According to the prediction of Life history theory that organisms are capable to increase their fitness who is either by producing many offspring or by producing fewer and also high-quality offspring. Offspring investment is extended by human but some it is obscured by their cultural mechanism.
In human species the quality and quantity doubt has been empirically shown in the species which produce litters or clutches, where their litter size is large which leads the small offspring size and their growth rate became slow and due to this their survival is getting reduced.
The Comparative analyses also help a negative and the inter-specific relationship between their reproductive rate and their offspring size
Answer:
Once they are cut,sperm can't get into the semen or out of the body. The testes will make sperm but the semen die and are absorbed by the body.
Explanation:
