a person who studies living things

(a)  

water + ANT

(a)  

your signature

(a)  

records many senses

(a)  

to measure

(a)  

.25 cents

(a)  

sound that comes from afar

(a)  

measures heat

(a)  

many-sided shape

(a)  

take one number away from another

(a)  

measuring of the earth + Y

(a)  

ruled by the people + Y

(a)  

poorly NOURISHED

(a)  

Good + FIT

(a)  

One thousandth of a second

(a)