Plz me asap

will mark brainliest

The answers are :-

1) Porifera

2)Cordate

3)Arthropods

4)Platyhelminthes

5)Mollusca

6)Cnidaria

7)Nematode

8)Annelida

9)Echinodermata

Explanation:

The explanation is as follows,

1) Porifera lack tissues

2) cordates have hollow nerve cord at some point of time

3) Arthropods have chitinous exoskeleton

4) Platyhelminthes class has the species flatworms

5)Mollusca contain the species molluskum.

6)Cnidaria have 2 layer cells

7)Nematoda have species round worms

8)Annelida have species segmented worms

9)Echinodermata have species with radial symmetry

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.