Plzzz help its a big grade Which change would increase the kinetic energy of a moving object the most?

A. reducing the mass by half
B. reducing the speed by half
C. doubling the mass of the object
D. doubling the speed of the object

Hemoglobin is the compound in red blood cells that carries oxygen to the body. the distribution of hemoglobin in women in g/dl of blood is approximately normally distributed with mean 14 and standard deviation 1. too little hemoglobin, and you're anemic. 2. too much, and (unless you live at high altitudes), you can have other problems.

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.