What is the si unit in time? a. second b. minute . c hour .d. day

A) Second

Second is the base unit of time.

Second

Explanation:

All the options from A through to D are correct units of time but in science, by agreement, the SI unit for time that is used is the second. Which is why speed is presented in meters per second, and acceleration in meters per second squared as just two examples. It is a more useful unit for measurements done in a science lab compared to a minute, hour or even worse a day.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

plz give brainliest

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates